Debian dsa-6566 : expat - security update

high Nessus Plugin ID 366409

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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-6566 advisory.

- ------------------------------------------------------------------------- Debian Security Advisory DSA-6566-1 [email protected] https://www.debian.org/security/ Salvatore Bonaccorso October 16, 2026 https://www.debian.org/security/faq
- -------------------------------------------------------------------------

Package : expat CVE ID : CVE-2026-66046 CVE-2026-76956 CVE-2026-76957 CVE-2026-77214 CVE-2026-93990 CVE-2026-102633 Debian Bug : 1144925 1144926 1144927 1148665 1149507 1150320

Several vulnerabilities have been discovered in Expat, an XML parsing C library, which could result in denial of service or potentially the execution of arbitrary code, if a malformed XML file is processed.

For the stable distribution (trixie), these problems have been fixed in version 2.9.0-1~deb13u1.

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 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 expat packages.

Plugin Details

Severity: High

ID: 366409

File Name: debian_DSA-6566.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Debian Local Security Checks

Published: 10/16/2026

Updated: 10/16/2026

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: 5.8

Percentile: 96.1

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5.3

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: 7

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:P/RL:O/RC:C

CVSS v4

Risk Factor: High

Base Score: 8.7

Threat Score: 7.7

Threat Vector: CVSS:4.0/E:P

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

CVSS Score Source: CVE-2026-93990

Vulnerability Information

CPE: cpe:/o:debian:debian_linux:13.0, 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 Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 10/16/2026

Vulnerability Publication Date: 8/18/2026

Reference Information

CVE: CVE-2026-102633, CVE-2026-66046, CVE-2026-76956, CVE-2026-76957, CVE-2026-77214, CVE-2026-93990

IAVA: 2026-A-0925-S, 2026-A-1045, 2026-A-1100

Detections

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