Debian dla-4765 : expat - security update

high Nessus Plugin ID 341830

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Synopsis

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

Description

The remote Debian 12 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-4765 advisory.

- ------------------------------------------------------------------------- Debian LTS Advisory DLA-4765-1 [email protected] https://www.debian.org/lts/security/ Andrej Shadura August 31, 2026 https://wiki.debian.org/LTS
- -------------------------------------------------------------------------

Package : expat Version : 2.5.0-1+deb12u3 CVE ID : CVE-2026-50219 CVE-2026-56131 CVE-2026-56403 CVE-2026-56404 CVE-2026-56405 CVE-2026-56406 CVE-2026-56407 CVE-2026-56408 CVE-2026-56409 CVE-2026-56410 CVE-2026-56411 CVE-2026-56412 CVE-2026-72522 CVE-2026-76957

CVE-2026-50219, CVE-2026-56131, CVE-2026-76957

Calling certain libexpat functions from within a handler could cause use-after-free.

CVE-2026-56403, CVE-2026-56404, CVE-2026-56405, CVE-2026-56406, CVE-2026-56407, CVE-2026-56408, CVE-2026-56409, CVE-2026-56410, CVE-2026-56411

Integer overflow in several functions.

CVE-2026-56412

A missing reentrancy guard around CDATA section handler calls could cause use-after-free.

CVE-2026-72522

An out-of-bounds read in expat's internal UTF-16 conversion functions could cause an infinite loop when processing crafted input, resulting in a denial of service.

For Debian 12 bookworm, these problems have been fixed in version 2.5.0-1+deb12u3.

We recommend that you upgrade your expat packages.

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

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

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 expat packages.

Plugin Details

Severity: High

ID: 341830

File Name: debian_DLA-4765.nasl

Version: 1.3

Type: Local

Agent: unix

Family: Debian Local Security Checks

Published: 8/31/2026

Updated: 9/10/2026

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: Medium

Score: 4.9

Percentile: 58.15

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5

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

CVSS Score Source: CVE-2026-76957

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.8

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

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

Vulnerability Information

CPE: cpe:/o:debian:debian_linux:12.0, p-cpe:/a:debian:debian_linux:expat, p-cpe:/a:debian:debian_linux:libexpat1-dev, p-cpe:/a:debian:debian_linux:libexpat1-udeb, p-cpe:/a:debian:debian_linux:libexpat1

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

Exploit Ease: No known exploits are available

Patch Publication Date: 8/31/2026

Vulnerability Publication Date: 6/4/2026

Reference Information

CVE: CVE-2026-50219, CVE-2026-56131, CVE-2026-56403, CVE-2026-56404, CVE-2026-56405, CVE-2026-56406, CVE-2026-56407, CVE-2026-56408, CVE-2026-56409, CVE-2026-56410, CVE-2026-56411, CVE-2026-56412, CVE-2026-72522, CVE-2026-76957

IAVA: 2026-A-0650-S, 2026-A-0899, 2026-A-0925

Detections

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