ImpactWhen an application passes user-controlled input to the upgrade option of client.request(), an attacker can inject CRLF sequences (\r\n) to: * Inject arbitrary HTTP headers * Terminate the HTTP request prematurely and smuggle raw data to non-HTTP services (Redis, Memcached, Elasticsearch) The vulnerability exists because undici writes the upgrade value directly to the socket without validating for invalid header characters: // lib/dispatcher/client-h1.js:1121 if (upgrade) { header += `connection: upgrade\r\nupgrade: ${upgrade}\r\n` }

The nodejs module Undici detected on the host is prior to version 6.24.0 or version 7.x prior to 7.24.0. It is, therefore, affected by multiple vulnerabilities :

  - A flaw exists due to allowing duplicate HTTP Content-Length headers when provided in an array with     case-variant names. An unauthenticated, remote attacker can exploit this to cause denial of service     or to perform HTTP request smuggling attacks leading to ACL bypass, cache poisoning, or credential     hijacking. (CVE-2026-1525)

  - A flaw exists in the WebSocket client due to unbounded memory consumption during permessage-deflate     decompression. An unauthenticated, remote attacker can exploit this, via a decompression bomb, to     cause denial of service. (CVE-2026-1526)

  - A flaw exists due to insufficient validation of the upgrade option in client.request(). An     authenticated, remote attacker can exploit this, via CRLF injection, to inject arbitrary HTTP headers     or smuggle raw data to non-HTTP services. (CVE-2026-1527)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote MiracleLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the AXSA:2026-465:01 advisory.

    * nodejs: Nodejs denial of service (CVE-2026-21637)
      * minimatch: minimatch: Denial of Service via specially crafted glob patterns (CVE-2026-26996)
      * undici: Undici: Denial of Service due to uncontrolled resource consumption (CVE-2026-2581)
      * undici: Undici: HTTP header injection and request smuggling vulnerability (CVE-2026-1527)
      * undici: undici: Denial of Service via unbounded memory consumption during WebSocket permessage-deflate     decompression (CVE-2026-1526)
      * undici: Undici: Denial of Service via invalid WebSocket permessage-deflate extension parameter     (CVE-2026-2229)
      * undici: Undici: HTTP Request Smuggling and Denial of Service due to duplicate Content-Length headers     (CVE-2026-1525)
      * undici: undici: Denial of Service via crafted WebSocket frame with large length (CVE-2026-1528)
      * nghttp2: nghttp2: Denial of Service via malformed HTTP/2 frames after session termination     (CVE-2026-27135)
      * Node.js: Node.js: Denial of Service via malformed Internationalized Domain Name processing     (CVE-2026-21712)
      * Node.js: Node.js: Denial of Service due to crafted HTTP `__proto__` header (CVE-2026-21710)
      * Node.js: Node.js: Information disclosure due to `fs.realpathSync.native()` bypassing filesystem read     restrictions (CVE-2026-21715)
      * nodejs: Node.js: Permission bypass allows unauthorized modification of file permissions and ownership     via incomplete security fix. (CVE-2026-21716)
      * Node.js: Node.js: Unauthorized inter-process communication due to missing Unix Domain Socket     permission checks (CVE-2026-21711)
      * Node.js: Node.js: Information disclosure via timing oracle in HMAC verification (CVE-2026-21713)
      * Node.js: Node.js: Memory leak and Denial of Service via crafted HTTP/2 WINDOW_UPDATE frames     (CVE-2026-21714)
      * nodejs: v8: Node.js: Denial of Service via V8 string hashing mechanism due to predictable hash     collisions (CVE-2026-21717)

Tenable has extracted the preceding description block directly from the MiracleLinux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote MiracleLinux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the AXSA:2026-449:01 advisory.

    * nodejs: Nodejs denial of service (CVE-2026-21637)
      * brace-expansion: brace-expansion: Denial of Service via unbounded brace range expansion     (CVE-2026-25547)
      * minimatch: minimatch: Denial of Service via specially crafted glob patterns (CVE-2026-26996)
      * undici: Undici: Denial of Service due to uncontrolled resource consumption (CVE-2026-2581)
      * undici: Undici: HTTP header injection and request smuggling vulnerability (CVE-2026-1527)
      * undici: undici: Denial of Service via unbounded memory consumption during WebSocket permessage-deflate     decompression (CVE-2026-1526)
      * undici: Undici: Denial of Service via invalid WebSocket permessage-deflate extension parameter     (CVE-2026-2229)
      * undici: Undici: HTTP Request Smuggling and Denial of Service due to duplicate Content-Length headers     (CVE-2026-1525)
      * undici: undici: Denial of Service via crafted WebSocket frame with large length (CVE-2026-1528)
      * nghttp2: nghttp2: Denial of Service via malformed HTTP/2 frames after session termination     (CVE-2026-27135)
      * Node.js: Node.js: Denial of Service via malformed Internationalized Domain Name processing     (CVE-2026-21712)
      * Node.js: Node.js: Denial of Service due to crafted HTTP `__proto__` header (CVE-2026-21710)
      * Node.js: Node.js: Information disclosure due to `fs.realpathSync.native()` bypassing filesystem read     restrictions (CVE-2026-21715)
      * nodejs: Node.js: Permission bypass allows unauthorized modification of file permissions and ownership     via incomplete security fix. (CVE-2026-21716)
      * Node.js: Node.js: Unauthorized inter-process communication due to missing Unix Domain Socket     permission checks (CVE-2026-21711)
      * Node.js: Node.js: Information disclosure via timing oracle in HMAC verification (CVE-2026-21713)
      * Node.js: Node.js: Memory leak and Denial of Service via crafted HTTP/2 WINDOW_UPDATE frames     (CVE-2026-21714)
      * nodejs: v8: Node.js: Denial of Service via V8 string hashing mechanism due to predictable hash     collisions (CVE-2026-21717)

Tenable has extracted the preceding description block directly from the MiracleLinux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Oracle Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2026-7350 advisory.

    nodejs     [1:24.14.1-2]
    - Update bundled nghttp2 to 1.68.1

    [1:24.14.1-1]
    - Update to version 24.14.1

    nodejs-nodemon     [3.0.3-3]
    - Keep BR on just npm

    [3.0.3-2]
    - Fix BR for nodejs-npm

    nodejs-packaging     [2021.06-6]
    - Properly handle @group/package deps in nodejs-symlink-deps       Resolves: RHEL-121581

    [2021.06-5]
    - nodejs.req to properly detect bundled deps

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote AlmaLinux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALSA-2026:7350 advisory.

    * nodejs: Nodejs denial of service (CVE-2026-21637)
      * brace-expansion: brace-expansion: Denial of Service via unbounded brace range expansion     (CVE-2026-25547)
      * minimatch: minimatch: Denial of Service via specially crafted glob patterns (CVE-2026-26996)
      * undici: Undici: Denial of Service due to uncontrolled resource consumption (CVE-2026-2581)
      * undici: Undici: HTTP header injection and request smuggling vulnerability (CVE-2026-1527)
      * undici: undici: Denial of Service via unbounded memory consumption during WebSocket permessage-deflate     decompression (CVE-2026-1526)
      * undici: Undici: Denial of Service via invalid WebSocket permessage-deflate extension parameter     (CVE-2026-2229)
      * undici: Undici: HTTP Request Smuggling and Denial of Service due to duplicate Content-Length headers     (CVE-2026-1525)
      * undici: undici: Denial of Service via crafted WebSocket frame with large length (CVE-2026-1528)
      * nghttp2: nghttp2: Denial of Service via malformed HTTP/2 frames after session termination     (CVE-2026-27135)
      * Node.js: Node.js: Denial of Service via malformed Internationalized Domain Name processing     (CVE-2026-21712)
      * Node.js: Node.js: Denial of Service due to crafted HTTP `__proto__` header (CVE-2026-21710)
      * Node.js: Node.js: Information disclosure due to `fs.realpathSync.native()` bypassing filesystem read     restrictions (CVE-2026-21715)
      * nodejs: Node.js: Permission bypass allows unauthorized modification of file permissions and ownership     via incomplete security fix. (CVE-2026-21716)
      * Node.js: Node.js: Unauthorized inter-process communication due to missing Unix Domain Socket     permission checks (CVE-2026-21711)
      * Node.js: Node.js: Information disclosure via timing oracle in HMAC verification (CVE-2026-21713)
      * Node.js: Node.js: Memory leak and Denial of Service via crafted HTTP/2 WINDOW_UPDATE frames     (CVE-2026-21714)
      * nodejs: v8: Node.js: Denial of Service via V8 string hashing mechanism due to predictable hash     collisions (CVE-2026-21717)

Tenable has extracted the preceding description block directly from the AlmaLinux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote AlmaLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALSA-2026:7670 advisory.

    * nodejs: Nodejs denial of service (CVE-2026-21637)
      * minimatch: minimatch: Denial of Service via specially crafted glob patterns (CVE-2026-26996)
      * undici: Undici: Denial of Service due to uncontrolled resource consumption (CVE-2026-2581)
      * undici: Undici: HTTP header injection and request smuggling vulnerability (CVE-2026-1527)
      * undici: undici: Denial of Service via unbounded memory consumption during WebSocket permessage-deflate     decompression (CVE-2026-1526)
      * undici: Undici: Denial of Service via invalid WebSocket permessage-deflate extension parameter     (CVE-2026-2229)
      * undici: Undici: HTTP Request Smuggling and Denial of Service due to duplicate Content-Length headers     (CVE-2026-1525)
      * undici: undici: Denial of Service via crafted WebSocket frame with large length (CVE-2026-1528)
      * nghttp2: nghttp2: Denial of Service via malformed HTTP/2 frames after session termination     (CVE-2026-27135)
      * Node.js: Node.js: Denial of Service via malformed Internationalized Domain Name processing     (CVE-2026-21712)
      * Node.js: Node.js: Denial of Service due to crafted HTTP `__proto__` header (CVE-2026-21710)
      * Node.js: Node.js: Information disclosure due to `fs.realpathSync.native()` bypassing filesystem read     restrictions (CVE-2026-21715)
      * nodejs: Node.js: Permission bypass allows unauthorized modification of file permissions and ownership     via incomplete security fix. (CVE-2026-21716)
      * Node.js: Node.js: Unauthorized inter-process communication due to missing Unix Domain Socket     permission checks (CVE-2026-21711)
      * Node.js: Node.js: Information disclosure via timing oracle in HMAC verification (CVE-2026-21713)
      * Node.js: Node.js: Memory leak and Denial of Service via crafted HTTP/2 WINDOW_UPDATE frames     (CVE-2026-21714)
      * nodejs: v8: Node.js: Denial of Service via V8 string hashing mechanism due to predictable hash     collisions (CVE-2026-21717)

Tenable has extracted the preceding description block directly from the AlmaLinux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote RockyLinux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2026:7675 advisory.

    * nodejs: Nodejs denial of service (CVE-2026-21637)

    * brace-expansion: brace-expansion: Denial of Service via unbounded brace range expansion (CVE-2026-25547)

    * minimatch: minimatch: Denial of Service via specially crafted glob patterns (CVE-2026-26996)

    * undici: Undici: Denial of Service due to uncontrolled resource consumption (CVE-2026-2581)

    * undici: Undici: HTTP header injection and request smuggling vulnerability (CVE-2026-1527)

    * undici: undici: Denial of Service via unbounded memory consumption during WebSocket permessage-deflate     decompression (CVE-2026-1526)

    * undici: Undici: Denial of Service via invalid WebSocket permessage-deflate extension parameter     (CVE-2026-2229)

    * undici: Undici: HTTP Request Smuggling and Denial of Service due to duplicate Content-Length headers     (CVE-2026-1525)

    * undici: undici: Denial of Service via crafted WebSocket frame with large length (CVE-2026-1528)

    * nghttp2: nghttp2: Denial of Service via malformed HTTP/2 frames after session termination     (CVE-2026-27135)

    * Node.js: Node.js: Denial of Service via malformed Internationalized Domain Name processing     (CVE-2026-21712)

    * Node.js: Node.js: Denial of Service due to crafted HTTP `__proto__` header (CVE-2026-21710)

    * Node.js: Node.js: Information disclosure due to `fs.realpathSync.native()` bypassing filesystem read     restrictions (CVE-2026-21715)

    * nodejs: Node.js: Permission bypass allows unauthorized modification of file permissions and ownership     via incomplete security fix. (CVE-2026-21716)

    * Node.js: Node.js: Unauthorized inter-process communication due to missing Unix Domain Socket permission     checks (CVE-2026-21711)

    * Node.js: Node.js: Information disclosure via timing oracle in HMAC verification (CVE-2026-21713)

    * Node.js: Node.js: Memory leak and Denial of Service via crafted HTTP/2 WINDOW_UPDATE frames     (CVE-2026-21714)

    * nodejs: v8: Node.js: Denial of Service via V8 string hashing mechanism due to predictable hash     collisions (CVE-2026-21717)

Tenable has extracted the preceding description block directly from the RockyLinux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote AlmaLinux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALSA-2026:7675 advisory.

    * nodejs: Nodejs denial of service (CVE-2026-21637)
      * brace-expansion: brace-expansion: Denial of Service via unbounded brace range expansion     (CVE-2026-25547)
      * minimatch: minimatch: Denial of Service via specially crafted glob patterns (CVE-2026-26996)
      * undici: Undici: Denial of Service due to uncontrolled resource consumption (CVE-2026-2581)
      * undici: Undici: HTTP header injection and request smuggling vulnerability (CVE-2026-1527)
      * undici: undici: Denial of Service via unbounded memory consumption during WebSocket permessage-deflate     decompression (CVE-2026-1526)
      * undici: Undici: Denial of Service via invalid WebSocket permessage-deflate extension parameter     (CVE-2026-2229)
      * undici: Undici: HTTP Request Smuggling and Denial of Service due to duplicate Content-Length headers     (CVE-2026-1525)
      * undici: undici: Denial of Service via crafted WebSocket frame with large length (CVE-2026-1528)
      * nghttp2: nghttp2: Denial of Service via malformed HTTP/2 frames after session termination     (CVE-2026-27135)
      * Node.js: Node.js: Denial of Service via malformed Internationalized Domain Name processing     (CVE-2026-21712)
      * Node.js: Node.js: Denial of Service due to crafted HTTP `__proto__` header (CVE-2026-21710)
      * Node.js: Node.js: Information disclosure due to `fs.realpathSync.native()` bypassing filesystem read     restrictions (CVE-2026-21715)
      * nodejs: Node.js: Permission bypass allows unauthorized modification of file permissions and ownership     via incomplete security fix. (CVE-2026-21716)
      * Node.js: Node.js: Unauthorized inter-process communication due to missing Unix Domain Socket     permission checks (CVE-2026-21711)
      * Node.js: Node.js: Information disclosure via timing oracle in HMAC verification (CVE-2026-21713)
      * Node.js: Node.js: Memory leak and Denial of Service via crafted HTTP/2 WINDOW_UPDATE frames     (CVE-2026-21714)
      * nodejs: v8: Node.js: Denial of Service via V8 string hashing mechanism due to predictable hash     collisions (CVE-2026-21717)

Tenable has extracted the preceding description block directly from the AlmaLinux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Oracle Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2026-7670 advisory.

    nodejs     [1:24.14.1-2]
    - Update bundled nghttp2 to 1.68.1       Related: RHEL-151374

    [1:24.14.1-1]
    - Update to 24.14.0       Resolves: RHEL-151374

    nodejs-nodemon     [3.0.3-1]
    - Initial import into nodejs:24 module

    nodejs-packaging     [2021.06-6]
    - Properly handle @group/package deps in nodejs-symlink-deps       Resolves: RHEL-121576

    [2021.06-5]
    - nodejs.req to properly detect bundled deps

    [2021.06-4]
    - NPM bundler: also find namespaced bundled dependencies

    [2021.06-3]
    - Rebuilt for https://fedoraproject.org/wiki/Fedora_35_Mass_Rebuild

    [2021.06-2]
    - Fix hard-coded output directory in the bundler

    [2021.06-1]
    - Update to 2021.06-1
    - bundler: Handle archaic license metadata
    - bundler: Warn about bundled dependencies with no license metadata

    [2021.01-3]
    - Rebuilt for https://fedoraproject.org/wiki/Fedora_34_Mass_Rebuild

    [2021.01-2]
    - nodejs-packaging-bundler improvements to handle uncommon characters

    [2021.01]
    - Add nodejs-packaging-bundler and update README.md

    [2020.09-1]
    - Move to dist-git as the upstream

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Oracle Linux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2026-7675 advisory.

    [1:24.14.1-2.0.1]
    - Update upstream references

    [1:24.14.1-2]
    - Update bundled nghttp2 to 1.68.1

    [1:24.14.1-1]
    - Update to version 24.14.1

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:7675 advisory.

    Node.js is a platform built on Chrome's JavaScript runtime for easily building fast, scalable network     applications. Node.js uses an event-driven, non-blocking I/O model that makes it lightweight and     efficient, perfect for data-intensive real-time applications that run across distributed devices.

    Security Fix(es):

    * nodejs: Nodejs denial of service (CVE-2026-21637)

    * brace-expansion: brace-expansion: Denial of Service via unbounded brace range expansion (CVE-2026-25547)

    * minimatch: minimatch: Denial of Service via specially crafted glob patterns (CVE-2026-26996)

    * undici: Undici: Denial of Service due to uncontrolled resource consumption (CVE-2026-2581)

    * undici: Undici: HTTP header injection and request smuggling vulnerability (CVE-2026-1527)

    * undici: undici: Denial of Service via unbounded memory consumption during WebSocket permessage-deflate     decompression (CVE-2026-1526)

    * undici: Undici: Denial of Service via invalid WebSocket permessage-deflate extension parameter     (CVE-2026-2229)

    * undici: Undici: HTTP Request Smuggling and Denial of Service due to duplicate Content-Length headers     (CVE-2026-1525)

    * undici: undici: Denial of Service via crafted WebSocket frame with large length (CVE-2026-1528)

    * nghttp2: nghttp2: Denial of Service via malformed HTTP/2 frames after session termination     (CVE-2026-27135)

    * Node.js: Node.js: Denial of Service via malformed Internationalized Domain Name processing     (CVE-2026-21712)

    * Node.js: Node.js: Denial of Service due to crafted HTTP `__proto__` header (CVE-2026-21710)

    * Node.js: Node.js: Information disclosure due to `fs.realpathSync.native()` bypassing filesystem read     restrictions (CVE-2026-21715)

    * nodejs: Node.js: Permission bypass allows unauthorized modification of file permissions and ownership     via incomplete security fix. (CVE-2026-21716)

    * Node.js: Node.js: Unauthorized inter-process communication due to missing Unix Domain Socket permission     checks (CVE-2026-21711)

    * Node.js: Node.js: Information disclosure via timing oracle in HMAC verification (CVE-2026-21713)

    * Node.js: Node.js: Memory leak and Denial of Service via crafted HTTP/2 WINDOW_UPDATE frames     (CVE-2026-21714)

    * nodejs: v8: Node.js: Denial of Service via V8 string hashing mechanism due to predictable hash     collisions (CVE-2026-21717)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:7670 advisory.

    Node.js is a software development platform for building fast and scalable network applications in the     JavaScript programming language.

    Security Fix(es):

    * nodejs: Nodejs denial of service (CVE-2026-21637)

    * minimatch: minimatch: Denial of Service via specially crafted glob patterns (CVE-2026-26996)

    * undici: Undici: Denial of Service due to uncontrolled resource consumption (CVE-2026-2581)

    * undici: Undici: HTTP header injection and request smuggling vulnerability (CVE-2026-1527)

    * undici: undici: Denial of Service via unbounded memory consumption during WebSocket permessage-deflate     decompression (CVE-2026-1526)

    * undici: Undici: Denial of Service via invalid WebSocket permessage-deflate extension parameter     (CVE-2026-2229)

    * undici: Undici: HTTP Request Smuggling and Denial of Service due to duplicate Content-Length headers     (CVE-2026-1525)

    * undici: undici: Denial of Service via crafted WebSocket frame with large length (CVE-2026-1528)

    * nghttp2: nghttp2: Denial of Service via malformed HTTP/2 frames after session termination     (CVE-2026-27135)

    * Node.js: Node.js: Denial of Service via malformed Internationalized Domain Name processing     (CVE-2026-21712)

    * Node.js: Node.js: Denial of Service due to crafted HTTP `__proto__` header (CVE-2026-21710)

    * Node.js: Node.js: Information disclosure due to `fs.realpathSync.native()` bypassing filesystem read     restrictions (CVE-2026-21715)

    * nodejs: Node.js: Permission bypass allows unauthorized modification of file permissions and ownership     via incomplete security fix. (CVE-2026-21716)

    * Node.js: Node.js: Unauthorized inter-process communication due to missing Unix Domain Socket permission     checks (CVE-2026-21711)

    * Node.js: Node.js: Information disclosure via timing oracle in HMAC verification (CVE-2026-21713)

    * Node.js: Node.js: Memory leak and Denial of Service via crafted HTTP/2 WINDOW_UPDATE frames     (CVE-2026-21714)

    * nodejs: v8: Node.js: Denial of Service via V8 string hashing mechanism due to predictable hash     collisions (CVE-2026-21717)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote RockyLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2026:7670 advisory.

    * nodejs: Nodejs denial of service (CVE-2026-21637)

    * minimatch: minimatch: Denial of Service via specially crafted glob patterns (CVE-2026-26996)

    * undici: Undici: Denial of Service due to uncontrolled resource consumption (CVE-2026-2581)

    * undici: Undici: HTTP header injection and request smuggling vulnerability (CVE-2026-1527)

    * undici: undici: Denial of Service via unbounded memory consumption during WebSocket permessage-deflate     decompression (CVE-2026-1526)

    * undici: Undici: Denial of Service via invalid WebSocket permessage-deflate extension parameter     (CVE-2026-2229)

    * undici: Undici: HTTP Request Smuggling and Denial of Service due to duplicate Content-Length headers     (CVE-2026-1525)

    * undici: undici: Denial of Service via crafted WebSocket frame with large length (CVE-2026-1528)

    * nghttp2: nghttp2: Denial of Service via malformed HTTP/2 frames after session termination     (CVE-2026-27135)

    * Node.js: Node.js: Denial of Service via malformed Internationalized Domain Name processing     (CVE-2026-21712)

    * Node.js: Node.js: Denial of Service due to crafted HTTP `__proto__` header (CVE-2026-21710)

    * Node.js: Node.js: Information disclosure due to `fs.realpathSync.native()` bypassing filesystem read     restrictions (CVE-2026-21715)

    * nodejs: Node.js: Permission bypass allows unauthorized modification of file permissions and ownership     via incomplete security fix. (CVE-2026-21716)

    * Node.js: Node.js: Unauthorized inter-process communication due to missing Unix Domain Socket permission     checks (CVE-2026-21711)

    * Node.js: Node.js: Information disclosure via timing oracle in HMAC verification (CVE-2026-21713)

    * Node.js: Node.js: Memory leak and Denial of Service via crafted HTTP/2 WINDOW_UPDATE frames     (CVE-2026-21714)

    * nodejs: v8: Node.js: Denial of Service via V8 string hashing mechanism due to predictable hash     collisions (CVE-2026-21717)

Tenable has extracted the preceding description block directly from the RockyLinux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote RockyLinux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2026:7350 advisory.

    * nodejs: Nodejs denial of service (CVE-2026-21637)

    * brace-expansion: brace-expansion: Denial of Service via unbounded brace range expansion (CVE-2026-25547)

    * minimatch: minimatch: Denial of Service via specially crafted glob patterns (CVE-2026-26996)

    * undici: Undici: Denial of Service due to uncontrolled resource consumption (CVE-2026-2581)

    * undici: Undici: HTTP header injection and request smuggling vulnerability (CVE-2026-1527)

    * undici: undici: Denial of Service via unbounded memory consumption during WebSocket permessage-deflate     decompression (CVE-2026-1526)

    * undici: Undici: Denial of Service via invalid WebSocket permessage-deflate extension parameter     (CVE-2026-2229)

    * undici: Undici: HTTP Request Smuggling and Denial of Service due to duplicate Content-Length headers     (CVE-2026-1525)

    * undici: undici: Denial of Service via crafted WebSocket frame with large length (CVE-2026-1528)

    * nghttp2: nghttp2: Denial of Service via malformed HTTP/2 frames after session termination     (CVE-2026-27135)

    * Node.js: Node.js: Denial of Service via malformed Internationalized Domain Name processing     (CVE-2026-21712)

    * Node.js: Node.js: Denial of Service due to crafted HTTP `__proto__` header (CVE-2026-21710)

    * Node.js: Node.js: Information disclosure due to `fs.realpathSync.native()` bypassing filesystem read     restrictions (CVE-2026-21715)

    * nodejs: Node.js: Permission bypass allows unauthorized modification of file permissions and ownership     via incomplete security fix. (CVE-2026-21716)

    * Node.js: Node.js: Unauthorized inter-process communication due to missing Unix Domain Socket permission     checks (CVE-2026-21711)

    * Node.js: Node.js: Information disclosure via timing oracle in HMAC verification (CVE-2026-21713)

    * Node.js: Node.js: Memory leak and Denial of Service via crafted HTTP/2 WINDOW_UPDATE frames     (CVE-2026-21714)

    * nodejs: v8: Node.js: Denial of Service via V8 string hashing mechanism due to predictable hash     collisions (CVE-2026-21717)

Tenable has extracted the preceding description block directly from the RockyLinux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:7350 advisory.

    Node.js is a software development platform for building fast and scalable network applications in the     JavaScript programming language.

    Security Fix(es):

    * nodejs: Nodejs denial of service (CVE-2026-21637)

    * brace-expansion: brace-expansion: Denial of Service via unbounded brace range expansion (CVE-2026-25547)

    * minimatch: minimatch: Denial of Service via specially crafted glob patterns (CVE-2026-26996)

    * undici: Undici: Denial of Service due to uncontrolled resource consumption (CVE-2026-2581)

    * undici: Undici: HTTP header injection and request smuggling vulnerability (CVE-2026-1527)

    * undici: undici: Denial of Service via unbounded memory consumption during WebSocket permessage-deflate     decompression (CVE-2026-1526)

    * undici: Undici: Denial of Service via invalid WebSocket permessage-deflate extension parameter     (CVE-2026-2229)

    * undici: Undici: HTTP Request Smuggling and Denial of Service due to duplicate Content-Length headers     (CVE-2026-1525)

    * undici: undici: Denial of Service via crafted WebSocket frame with large length (CVE-2026-1528)

    * nghttp2: nghttp2: Denial of Service via malformed HTTP/2 frames after session termination     (CVE-2026-27135)

    * Node.js: Node.js: Denial of Service via malformed Internationalized Domain Name processing     (CVE-2026-21712)

    * Node.js: Node.js: Denial of Service due to crafted HTTP `__proto__` header (CVE-2026-21710)

    * Node.js: Node.js: Information disclosure due to `fs.realpathSync.native()` bypassing filesystem read     restrictions (CVE-2026-21715)

    * nodejs: Node.js: Permission bypass allows unauthorized modification of file permissions and ownership     via incomplete security fix. (CVE-2026-21716)

    * Node.js: Node.js: Unauthorized inter-process communication due to missing Unix Domain Socket permission     checks (CVE-2026-21711)

    * Node.js: Node.js: Information disclosure via timing oracle in HMAC verification (CVE-2026-21713)

    * Node.js: Node.js: Memory leak and Denial of Service via crafted HTTP/2 WINDOW_UPDATE frames     (CVE-2026-21714)

    * nodejs: v8: Node.js: Denial of Service via V8 string hashing mechanism due to predictable hash     collisions (CVE-2026-21717)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-1526 advisory.

    Undici allows duplicate HTTP Content-Length headers when they are provided in an array with case-variant     names (e.g., Content-Length and content-length). This produces malformed HTTP/1.1 requests with multiple     conflicting Content-Length values on the wire.

    Who is impacted:

    *  Applications using undici.request(), undici.Client, or similar low-level APIs with headers passed as     flat arrays*  Applications that accept user-controlled header names without case-normalization

    Potential consequences:

    *  Denial of Service: Strict HTTP parsers (proxies, servers) will reject requests with duplicate Content-     Length headers (400 Bad Request)*  HTTP Request Smuggling: In deployments where an intermediary and     backend interpret duplicate headers inconsistently (e.g., one uses the first value, the other uses the     last), this can enable request smuggling attacks leading to ACL bypass, cache poisoning, or credential     hijacking (CVE-2026-1525)

    The undici WebSocket client is vulnerable to a denial-of-service attack via unbounded memory consumption     during permessage-deflate decompression. When a WebSocket connection negotiates the permessage-deflate     extension, the client decompresses incoming compressed frames without enforcing any limit on the     decompressed data size. A malicious WebSocket server can send a small compressed frame (a decompression     bomb) that expands to an extremely large size in memory, causing the Node.js process to exhaust available     memory and crash or become unresponsive.

    The vulnerability exists in the PerMessageDeflate.decompress() method, which accumulates all decompressed     chunks in memory and concatenates them into a single Buffer without checking whether the total size     exceeds a safe threshold. (CVE-2026-1526)

    ImpactWhen an application passes user-controlled input to the upgrade option of client.request(), an     attacker can inject CRLF sequences (\r\n) to:

    *  Inject arbitrary HTTP headers*  Terminate the HTTP request prematurely and smuggle raw data to non-HTTP     services (Redis, Memcached, Elasticsearch)The vulnerability exists because undici writes the upgrade value     directly to the socket without validating for invalid header characters:

    // lib/dispatcher/client-h1.js:1121if (upgrade) {header += `connection: upgrade\r\nupgrade:
    ${upgrade}\r\n`} (CVE-2026-1527)

    ImpactA server can reply with a WebSocket frame using the 64-bit length form and an extremely large     length. undici's ByteParser overflows internal math, ends up in an invalid state, and throws a fatal     TypeError that terminates the process.

    Patches

    Patched in the undici version v7.24.0 and v6.24.0. Users should upgrade to this version or later.
    (CVE-2026-1528)

    ImpactThe undici WebSocket client is vulnerable to a denial-of-service attack due to improper validation     of the server_max_window_bits parameter in the permessage-deflate extension. When a WebSocket client     connects to a server, it automatically advertises support for permessage-deflate compression. A malicious     server can respond with an out-of-range server_max_window_bits value (outside zlib's valid range of 8-15).
    When the server subsequently sends a compressed frame, the client attempts to create a zlib InflateRaw     instance with the invalid windowBits value, causing a synchronous RangeError exception that is not caught,     resulting in immediate process termination.

    The vulnerability exists because:

    *  The isValidClientWindowBits() function only validates that the value contains ASCII digits, not that it     falls within the valid range 8-15*  The createInflateRaw() call is not wrapped in a try-catch block*  The     resulting exception propagates up through the call stack and crashes the Node.js process (CVE-2026-2229)

    This is an uncontrolled resource consumption vulnerability (CWE-400) that can lead to Denial of Service     (DoS).

    In vulnerable Undici versions, when interceptors.deduplicate() is enabled, response data for deduplicated     requests could be accumulated in memory for downstream handlers. An attacker-controlled or untrusted     upstream endpoint can exploit this with large/chunked responses and concurrent identical requests, causing     high memory usage and potential OOM process termination.

    Impacted users are applications that use Undici's deduplication interceptor against endpoints that may     produce large or long-lived response bodies.

    PatchesThe issue has been patched by changing deduplication behavior to stream response chunks to     downstream handlers as they arrive (instead of full-body accumulation), and by preventing late     deduplication when body streaming has already started.

    Users should upgrade to the first official Undici (and Node.js, where applicable) releases that include     this patch. (CVE-2026-2581)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-1524 advisory.

    Undici allows duplicate HTTP Content-Length headers when they are provided in an array with case-variant     names (e.g., Content-Length and content-length). This produces malformed HTTP/1.1 requests with multiple     conflicting Content-Length values on the wire.

    Who is impacted:

    *  Applications using undici.request(), undici.Client, or similar low-level APIs with headers passed as     flat arrays*  Applications that accept user-controlled header names without case-normalization

    Potential consequences:

    *  Denial of Service: Strict HTTP parsers (proxies, servers) will reject requests with duplicate Content-     Length headers (400 Bad Request)*  HTTP Request Smuggling: In deployments where an intermediary and     backend interpret duplicate headers inconsistently (e.g., one uses the first value, the other uses the     last), this can enable request smuggling attacks leading to ACL bypass, cache poisoning, or credential     hijacking (CVE-2026-1525)

    The undici WebSocket client is vulnerable to a denial-of-service attack via unbounded memory consumption     during permessage-deflate decompression. When a WebSocket connection negotiates the permessage-deflate     extension, the client decompresses incoming compressed frames without enforcing any limit on the     decompressed data size. A malicious WebSocket server can send a small compressed frame (a decompression     bomb) that expands to an extremely large size in memory, causing the Node.js process to exhaust available     memory and crash or become unresponsive.

    The vulnerability exists in the PerMessageDeflate.decompress() method, which accumulates all decompressed     chunks in memory and concatenates them into a single Buffer without checking whether the total size     exceeds a safe threshold. (CVE-2026-1526)

    ImpactWhen an application passes user-controlled input to the upgrade option of client.request(), an     attacker can inject CRLF sequences (\r\n) to:

    *  Inject arbitrary HTTP headers*  Terminate the HTTP request prematurely and smuggle raw data to non-HTTP     services (Redis, Memcached, Elasticsearch)The vulnerability exists because undici writes the upgrade value     directly to the socket without validating for invalid header characters:

    // lib/dispatcher/client-h1.js:1121if (upgrade) {header += `connection: upgrade\r\nupgrade:
    ${upgrade}\r\n`} (CVE-2026-1527)

    ImpactA server can reply with a WebSocket frame using the 64-bit length form and an extremely large     length. undici's ByteParser overflows internal math, ends up in an invalid state, and throws a fatal     TypeError that terminates the process.

    Patches

    Patched in the undici version v7.24.0 and v6.24.0. Users should upgrade to this version or later.
    (CVE-2026-1528)

    ImpactThe undici WebSocket client is vulnerable to a denial-of-service attack due to improper validation     of the server_max_window_bits parameter in the permessage-deflate extension. When a WebSocket client     connects to a server, it automatically advertises support for permessage-deflate compression. A malicious     server can respond with an out-of-range server_max_window_bits value (outside zlib's valid range of 8-15).
    When the server subsequently sends a compressed frame, the client attempts to create a zlib InflateRaw     instance with the invalid windowBits value, causing a synchronous RangeError exception that is not caught,     resulting in immediate process termination.

    The vulnerability exists because:

    *  The isValidClientWindowBits() function only validates that the value contains ASCII digits, not that it     falls within the valid range 8-15*  The createInflateRaw() call is not wrapped in a try-catch block*  The     resulting exception propagates up through the call stack and crashes the Node.js process (CVE-2026-2229)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-1525 advisory.

    Undici allows duplicate HTTP Content-Length headers when they are provided in an array with case-variant     names (e.g., Content-Length and content-length). This produces malformed HTTP/1.1 requests with multiple     conflicting Content-Length values on the wire.

    Who is impacted:

    *  Applications using undici.request(), undici.Client, or similar low-level APIs with headers passed as     flat arrays*  Applications that accept user-controlled header names without case-normalization

    Potential consequences:

    *  Denial of Service: Strict HTTP parsers (proxies, servers) will reject requests with duplicate Content-     Length headers (400 Bad Request)*  HTTP Request Smuggling: In deployments where an intermediary and     backend interpret duplicate headers inconsistently (e.g., one uses the first value, the other uses the     last), this can enable request smuggling attacks leading to ACL bypass, cache poisoning, or credential     hijacking (CVE-2026-1525)

    The undici WebSocket client is vulnerable to a denial-of-service attack via unbounded memory consumption     during permessage-deflate decompression. When a WebSocket connection negotiates the permessage-deflate     extension, the client decompresses incoming compressed frames without enforcing any limit on the     decompressed data size. A malicious WebSocket server can send a small compressed frame (a decompression     bomb) that expands to an extremely large size in memory, causing the Node.js process to exhaust available     memory and crash or become unresponsive.

    The vulnerability exists in the PerMessageDeflate.decompress() method, which accumulates all decompressed     chunks in memory and concatenates them into a single Buffer without checking whether the total size     exceeds a safe threshold. (CVE-2026-1526)

    ImpactWhen an application passes user-controlled input to the upgrade option of client.request(), an     attacker can inject CRLF sequences (\r\n) to:

    *  Inject arbitrary HTTP headers*  Terminate the HTTP request prematurely and smuggle raw data to non-HTTP     services (Redis, Memcached, Elasticsearch)The vulnerability exists because undici writes the upgrade value     directly to the socket without validating for invalid header characters:

    // lib/dispatcher/client-h1.js:1121if (upgrade) {header += `connection: upgrade\r\nupgrade:
    ${upgrade}\r\n`} (CVE-2026-1527)

    ImpactA server can reply with a WebSocket frame using the 64-bit length form and an extremely large     length. undici's ByteParser overflows internal math, ends up in an invalid state, and throws a fatal     TypeError that terminates the process.

    Patches

    Patched in the undici version v7.24.0 and v6.24.0. Users should upgrade to this version or later.
    (CVE-2026-1528)

    ImpactThe undici WebSocket client is vulnerable to a denial-of-service attack due to improper validation     of the server_max_window_bits parameter in the permessage-deflate extension. When a WebSocket client     connects to a server, it automatically advertises support for permessage-deflate compression. A malicious     server can respond with an out-of-range server_max_window_bits value (outside zlib's valid range of 8-15).
    When the server subsequently sends a compressed frame, the client attempts to create a zlib InflateRaw     instance with the invalid windowBits value, causing a synchronous RangeError exception that is not caught,     resulting in immediate process termination.

    The vulnerability exists because:

    *  The isValidClientWindowBits() function only validates that the value contains ASCII digits, not that it     falls within the valid range 8-15*  The createInflateRaw() call is not wrapped in a try-catch block*  The     resulting exception propagates up through the call stack and crashes the Node.js process (CVE-2026-2229)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - ImpactWhen an application passes user-controlled input to the upgrade option of client.request(), an     attacker can inject CRLF sequences (\r\n) to: * Inject arbitrary HTTP headers * Terminate the HTTP request     prematurely and smuggle raw data to non-HTTP services (Redis, Memcached, Elasticsearch) The vulnerability     exists because undici writes the upgrade value directly to the socket without validating for invalid     header characters: // lib/dispatcher/client-h1.js:1121 if (upgrade) { header += `connection:
    upgrade\r\nupgrade: ${upgrade}\r\n` } (CVE-2026-1527)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Severity
309957	Node.js Module Undici < 6.24.0 / 7.x < 7.24.0 Multiple Vulnerabilities	Nessus	Misc.	critical
307486	MiracleLinux 8 : nodejs:24 (AXSA:2026-465:01)	Nessus	Miracle Linux Local Security Checks	high
307262	MiracleLinux 9 : nodejs:24 (AXSA:2026-449:01)	Nessus	Miracle Linux Local Security Checks	critical
307038	Oracle Linux 9 : nodejs:24 (ELSA-2026-7350)	Nessus	Oracle Linux Local Security Checks	critical
306669	AlmaLinux 9 : nodejs:24 (ALSA-2026:7350)	Nessus	Alma Linux Local Security Checks	critical
306667	AlmaLinux 8 : nodejs:24 (ALSA-2026:7670)	Nessus	Alma Linux Local Security Checks	high
306530	RockyLinux 10 : nodejs24 (RLSA-2026:7675)	Nessus	Rocky Linux Local Security Checks	critical
306516	AlmaLinux 10 : nodejs24 (ALSA-2026:7675)	Nessus	Alma Linux Local Security Checks	critical
306250	Oracle Linux 8 : nodejs:24 (ELSA-2026-7670)	Nessus	Oracle Linux Local Security Checks	high
306167	Oracle Linux 10 : nodejs24 (ELSA-2026-7675)	Nessus	Oracle Linux Local Security Checks	critical
306067	RHEL 10 : nodejs24 (RHSA-2026:7675)	Nessus	Red Hat Local Security Checks	critical
306066	RHEL 8 : nodejs:24 (RHSA-2026:7670)	Nessus	Red Hat Local Security Checks	high
306061	RockyLinux 8 : nodejs:24 (RLSA-2026:7670)	Nessus	Rocky Linux Local Security Checks	high
305802	RockyLinux 9 : nodejs:24 (RLSA-2026:7350)	Nessus	Rocky Linux Local Security Checks	critical
305798	RHEL 9 : nodejs:24 (RHSA-2026:7350)	Nessus	Red Hat Local Security Checks	critical
304617	Amazon Linux 2023 : nodejs24, nodejs24-devel, nodejs24-full-i18n (ALAS2023-2026-1526)	Nessus	Amazon Linux Local Security Checks	critical
304597	Amazon Linux 2023 : nodejs20, nodejs20-devel, nodejs20-full-i18n (ALAS2023-2026-1524)	Nessus	Amazon Linux Local Security Checks	critical
304569	Amazon Linux 2023 : nodejs22, nodejs22-devel, nodejs22-full-i18n (ALAS2023-2026-1525)	Nessus	Amazon Linux Local Security Checks	critical
302060	Linux Distros Unpatched Vulnerability : CVE-2026-1527	Nessus	Misc.	medium

Detections

Analytics

CVE-2026-1527

medium

Tenable Plugins

critical

high

critical

critical

critical

high

critical

critical

high

critical

critical

high

high

critical

critical

critical

critical

critical

medium