quic-go is an implementation of the QUIC protocol in Go. Prior to version 0.59.1, an attacker can cause excessive memory allocation in quic-go's HTTP/3 client and server implementations by sending a QPACK-encoded HEADERS frame that decodes into a large trailer field section with many unique field names and/or large values. The implementation builds an `http.Header` for the corresponding `http.Request` or `http.Response`, while only enforcing limits on the size of the QPACK-compressed HEADERS frame, not on the decoded field section. This can lead to memory exhaustion. This is very similar to CVE-2025-64702. The difference is that this issue uses HTTP trailers, rather than HTTP headers, as the attack vector. A misbehaving or malicious peer can cause a denial-of-service (DoS) attack against quic-go's HTTP/3 servers or clients by triggering excessive memory allocation, potentially leading to crashes or resource exhaustion. This affects both servers and clients due to symmetric header construction. Version 0.59.1 enforces RFC 9114 decoded field section size limits for trailers as well. It incrementally decodes QPACK entries and checks the field section size after each entry, aborting the stream if an entry causes the limit to be exceeded.

The remote Redhat Enterprise Linux 10 / 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:50336 advisory.

    Red Hat Ansible Automation Platform provides an enterprise framework for building, deploying and managing     IT automation at scale. IT Managers can provide top-down guidelines on how automation is applied to     individual teams, while automation developers retain the freedom to write tasks that leverage existing     knowledge without the overhead. Ansible Automation Platform makes it possible for users across an     organization to share, vet, and manage automation content by means of a simple, powerful, and agentless     language.

    Security Fix(es):

    * automation-controller: PyJWT: Authentication bypass due to forged JSON Web Tokens (CVE-2026-48526)
    * automation-eda-controller: ExternalEventStreamViewSet trusts Subject header without validation and leaks     expected DN (CVE-2026-12383)
    * automation-eda-controller: Authentication bypass in Event-Driven Ansible via forged HTTP header     (CVE-2026-18141)
    * automation-gateway-proxy: Go net package: Denial of Service via long CNAME response in LookupCNAME     (CVE-2026-33811)
    * python3.12-aiohttp: Arbitrary code execution via untrusted input to CookieJar.load() (CVE-2026-34993)
    * python3.12-daphne: daphne: Denial of Service via excessive WebSocket message size (CVE-2026-44545)
    * python3.12-pillow: Denial of Service via crafted GD 2.x image file (CVE-2026-55380)
    * python3.12-pillow: Denial of Service via crafted BDF font file (CVE-2026-55379)
    * python3.12-pillow: Denial of Service via excessive memory allocation when processing font files     (CVE-2026-54060)
    * python3.12-pillow: Denial of Service via crafted PCF font data (CVE-2026-54059)
    * python3.12-pillow: Native heap out-of-bounds write (CVE-2026-59197)
    * python3.12-pyasn1: Denial of Service via crafted ASN.1 REAL values (CVE-2026-59886)
    * python3.12-pyasn1: Denial of Service via crafted ASN.1 OBJECT IDENTIFIER (CVE-2026-59885)
    * receptor: quic-go: Denial of Service via excessive memory allocation in HTTP/3 trailers (CVE-2026-40898)

    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.

    For details about this release, refer to the release notes 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 / 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:50319 advisory.

    Red Hat Ansible Automation Platform provides an enterprise framework for building, deploying and managing     IT automation at scale. IT Managers can provide top-down guidelines on how automation is applied to     individual teams, while automation developers retain the freedom to write tasks that leverage existing     knowledge without the overhead. Ansible Automation Platform makes it possible for users across an     organization to share, vet, and manage automation content by means of a simple, powerful, and agentless     language.

    Security Fix(es):

    * automation-controller: PyJWT: Authentication bypass due to forged JSON Web Tokens (CVE-2026-48526)
    * automation-eda-controller: ExternalEventStreamViewSet trusts Subject header without validation and leaks     expected DN (CVE-2026-12383)
    * automation-gateway-proxy: Go net package: Denial of Service via long CNAME response in LookupCNAME     (CVE-2026-33811)
    * python3.12-aiohttp: Arbitrary code execution via untrusted input to CookieJar.load() (CVE-2026-34993)
    * python3.12-daphne: daphne: Denial of Service via excessive WebSocket message size (CVE-2026-44545)
    * python3.12-pillow: Denial of Service via crafted PCF font data (CVE-2026-54059)
    * python3.12-pillow: Denial of Service via excessive memory allocation when processing font files     (CVE-2026-54060)
    * python3.12-pillow: Denial of Service via crafted BDF font file (CVE-2026-55379)
    * python3.12-pillow: Denial of Service via crafted GD 2.x image file (CVE-2026-55380)
    * python3.12-pillow: Native heap out-of-bounds write (CVE-2026-59197)
    * python3.12-pyasn1: Denial of Service via crafted ASN.1 REAL values (CVE-2026-59885)
    * python3.12-pyasn1: Denial of Service via crafted ASN.1 OBJECT IDENTIFIER (CVE-2026-59886)
    * receptor: quic-go: Denial of Service via excessive memory allocation in HTTP/3 trailers (CVE-2026-40898)
    * receptor: golang crypto/x509: Denial of Service via excessive processing of DNS SAN entries     (CVE-2026-27145)

    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.

    For details about this release, refer to the release notes 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 10 / 9 host has a package installed that is affected by a vulnerability as referenced in the RHSA-2026:50318 advisory.

    Red Hat Ansible Automation Platform provides an enterprise framework for building, deploying and managing     IT automation at scale. IT Managers can provide top-down guidelines on how automation is applied to     individual teams, while automation developers retain the freedom to write tasks that leverage existing     knowledge without the overhead. Ansible Automation Platform makes it possible for users across an     organization to share, vet, and manage automation content by means of a simple, powerful, and agentless     language.

    Security Fix(es):

    * receptor: quic-go: Denial of Service via excessive memory allocation in HTTP/3 trailers (CVE-2026-40898)

    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.

    For details about this release, refer to the release notes 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 this issue but has instead relied only on the application's self-reported version number.

The remote Fedora 44 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2026-e07fd81708 advisory.

    Update to 3.13.1

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

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

The remote Fedora 43 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2026-6a44db4fa9 advisory.

    Update to 3.13.1

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

Note that Nessus has not tested for this issue 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.

  - quic-go is an implementation of the QUIC protocol in Go. Prior to version 0.59.1, an attacker can cause     excessive memory allocation in quic-go's HTTP/3 client and server implementations by sending a QPACK-     encoded HEADERS frame that decodes into a large trailer field section with many unique field names and/or     large values. The implementation builds an `http.Header` for the corresponding `http.Request` or     `http.Response`, while only enforcing limits on the size of the QPACK-compressed HEADERS frame, not on the     decoded field section. This can lead to memory exhaustion. This is very similar to CVE-2025-64702. The     difference is that this issue uses HTTP trailers, rather than HTTP headers, as the attack vector. A     misbehaving or malicious peer can cause a denial-of-service (DoS) attack against quic-go's HTTP/3 servers     or clients by triggering excessive memory allocation, potentially leading to crashes or resource     exhaustion. This affects both servers and clients due to symmetric header construction. Version 0.59.1     enforces RFC 9114 decoded field section size limits for trailers as well. It incrementally decodes QPACK     entries and checks the field section size after each entry, aborting the stream if an entry causes the     limit to be exceeded. (CVE-2026-40898)

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

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - quic-go is an implementation of the QUIC protocol in Go. Prior to version 0.59.1, an attacker can cause
    excessive memory allocation in quic-go's HTTP/3 client and server implementations by sending a QPACK-
    encoded HEADERS frame that decodes into a large trailer field section with many unique field names and/or
    large values. The implementation builds an `http.Header` for the corresponding `http.Request` or
    `http.Response`, while only enforcing limits on the size of the QPACK-compressed HEADERS frame, not on the
    decoded field section. This can lead to memory exhaustion. This is very similar to CVE-2025-64702. The
    difference is that this issue uses HTTP trailers, rather than HTTP headers, as the attack vector. A
    misbehaving or malicious peer can cause a denial-of-service (DoS) attack against quic-go's HTTP/3 servers
    or clients by triggering excessive memory allocation, potentially leading to crashes or resource
    exhaustion. This affects both servers and clients due to symmetric header construction. Version 0.59.1
    enforces RFC 9114 decoded field section size limits for trailers as well. It incrementally decodes QPACK
    entries and checks the field section size after each entry, aborting the stream if an entry causes the
    limit to be exceeded. (CVE-2026-40898)

ID	Name	Product	Family	Type	Severity
331965	RHEL 10 / 9 : Red Hat Ansible Automation Platform 2.6 Product Security and Bug Fix Update (Important) (RHSA-2026:50336)	Nessus	Red Hat Local Security Checks	Local	high
331963	RHEL 8 / 9 : Red Hat Ansible Automation Platform 2.5 Product Security and Bug Fix Update (Important) (RHSA-2026:50319)	Nessus	Red Hat Local Security Checks	Local	high
331953	RHEL 10 / 9 : Red Hat Ansible Automation Platform 2.7 Product Security and Bug Fix Update (Important) (RHSA-2026:50318)	Nessus	Red Hat Local Security Checks	Local	high
326883	Fedora 44 : prometheus (2026-e07fd81708)	Nessus	Fedora Local Security Checks	Local	high
326881	Fedora 43 : prometheus (2026-6a44db4fa9)	Nessus	Fedora Local Security Checks	Local	high
318811	Linux Distros Unpatched Vulnerability : CVE-2026-40898	Nessus	Misc.	Local	high
442605	SCA: security update for github.com/quic-go/quic-go (GHSA-vvgj-x9jq-8cj9)	Tenable Cloud Security	SCA Checks	Local	high
442605	SCA: security update for github.com/quic-go/quic-go (GHSA-vvgj-x9jq-8cj9)	Tenable Self-Hosted Container Security	SCA Checks	Local	high

Detections

Analytics

CVE-2026-40898

high

Tenable Plugins

high

high

high

high

high

high

high

high