Debian dla-4660 : libnginx-mod-http-auth-pam - security update

critical Nessus Plugin ID 324046

Synopsis

The remote Debian host is missing one or more security-related updates.

Description

The remote Debian 11 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-4660 advisory.

------------------------------------------------------------------------- Debian LTS Advisory DLA-4660-1 [email protected] https://www.debian.org/lts/security/ Carlos Henrique Lima Melara June 30, 2026 https://wiki.debian.org/LTS
-------------------------------------------------------------------------

Package : nginx Version : 1.18.0-6.1+deb11u8 CVE ID : CVE-2026-42055 CVE-2026-48142 Debian Bug : 1138794 1140359 1140361

Multiple vulnerabilities were discoverd in Nginx, a high-performance web and reverse proxy server, which could result in remote code execution, denial of service or memory disclosure.

CVE-2026-42055

NGINX Open Source has a vulnerability in the ngx_http_proxy_v2_module and ngx_http_grpc_module modules. This vulnerability exists when the proxy_http_version to 2 or grpc_pass directives are used to proxy HTTP/2 traffic, the ignore_invalid_headers directive is set to off, and the large_client_header_buffers directive size is larger than 2 megabytes. A remote, unauthenticated attacker, along with conditions beyond their control, could send large headers while creating an upstream request. This may cause a heap-based buffer overflow in the NGINX worker process leading to a restart. Additionally, attackers can execute code on systems with Address Space Layout Randomization (ASLR) disabled or when the attacker can bypass ASLR.

CVE-2026-48142

NGINX Open Source has a vulnerability in the ngx_http_charset_module module.
When content is served or proxied through a location block with both source_charset utf-8; and a charset directive (for example, charset koi8-r;) configured, remote, unauthenticated attackers can send requests (in conjunction with conditions beyond their control) to cause a heap buffer over-read in the NGINX worker process, leading to limited disclosure of memory or a restart.

No CVE assigned yet

HTTP/2 Bomb denial of service

For Debian 11 bullseye, these problems have been fixed in version 1.18.0-6.1+deb11u8.

We recommend that you upgrade your nginx packages.

For the detailed security status of nginx please refer to its security tracker page at:
https://security-tracker.debian.org/tracker/nginx

Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: https://wiki.debian.org/LTS Attachment:
signature.asc Description: PGP signature

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

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

Solution

Upgrade the libnginx-mod-http-auth-pam packages.

Plugin Details

Severity: Critical

ID: 324046

File Name: debian_DLA-4660.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Debian Local Security Checks

Published: 7/1/2026

Updated: 7/1/2026

Supported Sensors: Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.02

CVSS v2

Risk Factor: High

Base Score: 7.6

Temporal Score: 5.6

Vector: CVSS2#AV:N/AC:H/Au:N/C:C/I:C/A:C

CVSS Score Source: CVE-2026-42055

CVSS v3

Risk Factor: High

Base Score: 8.1

Temporal Score: 7.1

Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

CVSS v4

Risk Factor: Critical

Base Score: 9.2

Threat Score: 7.2

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:libnginx-mod-http-xslt-filter, cpe:/o:debian:debian_linux:11.0, p-cpe:/a:debian:debian_linux:libnginx-mod-http-upstream-fair, p-cpe:/a:debian:debian_linux:nginx-light, p-cpe:/a:debian:debian_linux:libnginx-mod-http-auth-pam, p-cpe:/a:debian:debian_linux:libnginx-mod-http-ndk, p-cpe:/a:debian:debian_linux:nginx-doc, p-cpe:/a:debian:debian_linux:nginx-extras, p-cpe:/a:debian:debian_linux:libnginx-mod-http-subs-filter, p-cpe:/a:debian:debian_linux:libnginx-mod-http-uploadprogress, p-cpe:/a:debian:debian_linux:libnginx-mod-http-perl, p-cpe:/a:debian:debian_linux:libnginx-mod-stream-geoip2, p-cpe:/a:debian:debian_linux:libnginx-mod-http-fancyindex, p-cpe:/a:debian:debian_linux:libnginx-mod-http-lua, p-cpe:/a:debian:debian_linux:libnginx-mod-mail, p-cpe:/a:debian:debian_linux:libnginx-mod-stream, p-cpe:/a:debian:debian_linux:nginx-core, p-cpe:/a:debian:debian_linux:nginx-full, p-cpe:/a:debian:debian_linux:libnginx-mod-stream-geoip, p-cpe:/a:debian:debian_linux:libnginx-mod-http-cache-purge, p-cpe:/a:debian:debian_linux:libnginx-mod-http-echo, p-cpe:/a:debian:debian_linux:libnginx-mod-http-headers-more-filter, p-cpe:/a:debian:debian_linux:libnginx-mod-nchan, p-cpe:/a:debian:debian_linux:nginx-common, p-cpe:/a:debian:debian_linux:libnginx-mod-http-image-filter, p-cpe:/a:debian:debian_linux:libnginx-mod-http-geoip, p-cpe:/a:debian:debian_linux:libnginx-mod-http-geoip2, p-cpe:/a:debian:debian_linux:nginx, p-cpe:/a:debian:debian_linux:libnginx-mod-http-dav-ext, p-cpe:/a:debian:debian_linux:libnginx-mod-rtmp

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

Exploit Ease: No known exploits are available

Patch Publication Date: 6/30/2026

Vulnerability Publication Date: 6/17/2026

Reference Information

CVE: CVE-2026-42055, CVE-2026-48142

IAVA: 2026-A-0601

Detections

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