Debian dsa-6105 : modsecurity-crs - security update

critical Nessus Plugin ID 294903

Synopsis

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

Description

The remote Debian 12 / 13 host has a package installed that is affected by a vulnerability as referenced in the dsa-6105 advisory.

- ------------------------------------------------------------------------- Debian Security Advisory DSA-6105-1 [email protected] https://www.debian.org/security/ Moritz Muehlenhoff January 21, 2026 https://www.debian.org/security/faq
- -------------------------------------------------------------------------

Package : modsecurity-crs CVE ID : CVE-2026-21876

It was discovered that one of the rules in the OWASP ModSecurity Core Rule Set parsed some multipart requests incorrectly.

For the oldstable distribution (bookworm), this problem has been fixed in version 3.3.4-1+deb12u1.

For the stable distribution (trixie), this problem has been fixed in version 3.3.7-1+deb13u1.

We recommend that you upgrade your modsecurity-crs packages.

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

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

Solution

Upgrade the modsecurity-crs packages.

Plugin Details

Severity: Critical

ID: 294903

File Name: debian_DSA-6105.nasl

Version: 1.1

Type: local

Agent: unix

Family: Debian Local Security Checks

Published: 1/21/2026

Updated: 1/21/2026

Supported Sensors: Continuous Assessment, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: High

Base Score: 8.5

Temporal Score: 6.7

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

CVSS Score Source: CVE-2026-21876

CVSS v3

Risk Factor: Critical

Base Score: 9.3

Temporal Score: 8.4

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

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

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:modsecurity-crs, cpe:/o:debian:debian_linux:12.0, cpe:/o:debian:debian_linux:13.0

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: 1/21/2026

Vulnerability Publication Date: 1/8/2026

Reference Information

CVE: CVE-2026-21876

Detections

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