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Debian dsa-6496 : libnginx-mod-http-geoip - security update

critical Nessus Plugin ID 345000

Synopsis

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

Description

The remote Debian 13 host has packages installed that are affected by multiple vulnerabilities as referenced in the dsa-6496 advisory.

 - ------------------------------------------------------------------------- Debian Security Advisory DSA-6496-1 [email protected] https://www.debian.org/security/ Aron Xu September 12, 2026 https://www.debian.org/security/faq
 - -------------------------------------------------------------------------

 Package : nginx CVE ID : CVE-2026-42533 CVE-2026-56434 CVE-2026-60005

 Multiple vulnerabilities were discovered in nginx, a high-performance web and reverse proxy server, which may result in denial of service, memory disclosure or potentially the execution of arbitrary code.

 CVE-2026-42533

 A heap buffer overflow was discovered in the nginx script engine. It can be triggered when a map directive performs regular expression matching and a string expression references captures modified by the map, or when non-cacheable variables change between the script length pass and the script copy pass.

 CVE-2026-56434

 Duplicate finalization of an HTTP subrequest can result in a use-after-free. The issue is observable in configurations using server-side includes together with proxy_pass and proxy_buffering disabled, when an upstream response causes the same subrequest to be posted twice.

 CVE-2026-60005

 ngx_http_regex_exec() could replace the captures array without clearing r->ncaptures when the new regular expression did not match.
 A subsequent unnamed capture could then access uninitialised memory, resulting in memory disclosure.

 For the stable distribution (trixie), these problems have been fixed in version 1.26.3-3+deb13u8.

 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 Security Advisories, how to apply these updates to your system and frequently asked questions can be found at: https://www.debian.org/security/

 Mailing list: [email protected]

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-geoip packages.

See Also

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

https://security-tracker.debian.org/tracker/CVE-2026-42533

https://security-tracker.debian.org/tracker/CVE-2026-56434

https://security-tracker.debian.org/tracker/CVE-2026-60005

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

Plugin Details

Severity: Critical

ID: 345000

File Name: debian_DSA-6496.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 9/12/2026

Updated: 9/12/2026

Supported Sensors: Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Continuous Assessment, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: High

Score: 7.9

Percentile: 99.36

CVSS v2

Risk Factor: High

Base Score: 8.5

Temporal Score: 6.7

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

CVSS Score Source: CVE-2026-60005

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 Score Source: CVE-2026-42533

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:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS Score Source: CVE-2026-42533

Vulnerability Information

CPE: cpe:/o:debian:debian_linux:13.0, p-cpe:/a:debian:debian_linux:libnginx-mod-http-geoip, p-cpe:/a:debian:debian_linux:libnginx-mod-http-image-filter, p-cpe:/a:debian:debian_linux:libnginx-mod-http-perl, p-cpe:/a:debian:debian_linux:libnginx-mod-http-xslt-filter, p-cpe:/a:debian:debian_linux:libnginx-mod-mail, p-cpe:/a:debian:debian_linux:libnginx-mod-stream-geoip, p-cpe:/a:debian:debian_linux:libnginx-mod-stream, p-cpe:/a:debian:debian_linux:nginx-common, p-cpe:/a:debian:debian_linux:nginx-core, p-cpe:/a:debian:debian_linux:nginx-dev, p-cpe:/a:debian:debian_linux:nginx-doc, p-cpe:/a:debian:debian_linux:nginx-extras, p-cpe:/a:debian:debian_linux:nginx-full, p-cpe:/a:debian:debian_linux:nginx-light, p-cpe:/a:debian:debian_linux:nginx

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: 9/12/2026

Vulnerability Publication Date: 7/15/2026

Reference Information

CVE: CVE-2026-42533, CVE-2026-56434, CVE-2026-60005

IAVA: 2026-A-0754