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Debian dla-4849 : expat - security update

high Nessus Plugin ID 370475

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-4849 advisory.

 - ------------------------------------------------------------------------- Debian LTS Advisory DLA-4849-1 [email protected] https://www.debian.org/lts/security/ Andrej Shadura October 22, 2026 https://wiki.debian.org/LTS
 - -------------------------------------------------------------------------

 Package : expat Version : 2.5.0-1+deb12u5 CVE ID : CVE-2025-59375 CVE-2026-56132 CVE-2026-77214 CVE-2026-102633

 Multiple vulnerabilities have been found in expat.

 CVE-2025-59375

 The patchset previously uploaded in DLA-4807-1 did not fully address the issue since a major part of it was conditionally included only when XML_GE was enabled. This upload enables that define.

 CVE-2026-56132

 A heap-based buffer overflow in doProlog in xmlparse.c caused by scaffold backing array reallocation which was mishandled when there was data-structure sharing across parsers.

 CVE-2026-77214

 A heap buffer over-read vulnerability in XML_ParseBuffer allowed recovering heap pointers, libc function pointers, and code pointers sufficient to defeat ASLR and build further exploitation primitives.

 CVE-2026-102633

 An integer overflow vulnerability in expat_realloc() function on 32-bit platforms when computing allocation sizes was found in the code fixing CVE-2025-59375

 For Debian 12 bookworm, these problems have been fixed in version 2.5.0-1+deb12u5.

 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.

See Also

https://packages.debian.org/source/bookworm/expat

https://security-tracker.debian.org/tracker/CVE-2025-59375

https://security-tracker.debian.org/tracker/CVE-2026-102633

https://security-tracker.debian.org/tracker/CVE-2026-56132

https://security-tracker.debian.org/tracker/CVE-2026-77214

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

Plugin Details

Severity: High

ID: 370475

File Name: debian_DLA-4849.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 10/22/2026

Updated: 10/22/2026

Supported Sensors: Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.7

Percentile: 95.89

CVSS v2

Risk Factor: Medium

Base Score: 5.4

Temporal Score: 4

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

CVSS Score Source: CVE-2026-102633

CVSS v3

Risk Factor: Medium

Base Score: 6.9

Temporal Score: 6

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

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

CVSS Score Source: CVE-2026-56132

CVSS v4

Risk Factor: High

Base Score: 8.3

Threat Score: 4.8

Threat Vector: CVSS:4.0/E:U

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

CVSS Score Source: CVE-2026-77214

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: 10/22/2026

Vulnerability Publication Date: 6/19/2026

Reference Information

CVE: CVE-2025-59375, CVE-2026-102633, CVE-2026-56132, CVE-2026-77214

IAVA: 2026-A-0650-S, 2026-A-1100