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Debian dla-4634 : libnginx-mod-http-auth-pam - security update

critical Nessus Plugin ID 321720

Synopsis

The remote Debian host is missing a security-related update.

Description

The remote Debian 11 host has packages installed that are affected by a vulnerability as referenced in the dla-4634 advisory.

 ------------------------------------------------------------------------- Debian LTS Advisory DLA-4634-1 [email protected] https://www.debian.org/lts/security/ Carlos Henrique Lima Melara June 17, 2026 https://wiki.debian.org/LTS
 -------------------------------------------------------------------------

 Package : nginx Version : 1.18.0-6.1+deb11u7 CVE ID : CVE-2026-9256 Debian Bug : 1137339


 A vulnerability was discoverd in Nginx, a high-performance web and reverse proxy server, which could result in remote code execution and denial of service.

 For Debian 11 bullseye, this problem has been fixed in version 1.18.0-6.1+deb11u7.

 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 this issue but has instead relied only on the application's self-reported version number.

Solution

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

See Also

https://security-tracker.debian.org/tracker/source-package/nginx

https://security-tracker.debian.org/tracker/CVE-2026-9256

https://packages.debian.org/source/bullseye/nginx

Plugin Details

Severity: Critical

ID: 321720

File Name: debian_DLA-4634.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 6/20/2026

Updated: 6/20/2026

Supported Sensors: Continuous Assessment, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: High

Score: 7.4

CVSS v2

Risk Factor: High

Base Score: 7.6

Temporal Score: 6

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

CVSS Score Source: CVE-2026-9256

CVSS v3

Risk Factor: High

Base Score: 8.1

Temporal Score: 7.3

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:P/RL:O/RC:C

CVSS v4

Risk Factor: Critical

Base Score: 9.2

Threat Score: 8.2

Threat Vector: CVSS:4.0/E:P

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-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, 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

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 6/17/2026

Vulnerability Publication Date: 5/22/2026

Reference Information

CVE: CVE-2026-9256

IAVA: 2026-A-0515