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Debian dla-4690 : liblzma-dev - security update

medium Nessus Plugin ID 328854

Synopsis

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

Description

The remote Debian 11 host has packages installed that are affected by a vulnerability as referenced in the dla-4690 advisory.

 - ------------------------------------------------------------------------- Debian LTS Advisory DLA-4690-1 [email protected] https://www.debian.org/lts/security/ Chris Lamb July 20, 2026 https://wiki.debian.org/LTS
 - -------------------------------------------------------------------------

 Package : xz-utils Version : 5.2.5-2.1~deb11u2 CVE ID : CVE-2026-34743 Debian Bug : 1132497

 It was discovered that there was a potential buffer overflow in xz-utils, a popular data-compression utility and library.

 CVE-2026-34743

 If the lzma_index_decoder function was used to decode an index that contained no records, the resulting lzma_index was left in a state where where a subsequent lzma_index_append would allocate too little memory and a buffer overflow would therefore occur.

 For Debian 11 bullseye, this problem has been fixed in version 5.2.5-2.1~deb11u2;

 We recommend that you upgrade your xz-utils packages.

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

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

Solution

Upgrade the liblzma-dev packages.

See Also

https://packages.debian.org/source/bullseye/xz-utils

https://security-tracker.debian.org/tracker/CVE-2026-34743

https://security-tracker.debian.org/tracker/source-package/xz-utils

Plugin Details

Severity: Medium

ID: 328854

File Name: debian_DLA-4690.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 7/21/2026

Updated: 7/21/2026

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: Low

Score: 1.2

Percentile: 0.01

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

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

CVSS Score Source: CVE-2026-34743

CVSS v3

Risk Factor: Medium

Base Score: 5.3

Temporal Score: 4.6

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

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

CVSS v4

Risk Factor: Medium

Base Score: 6.3

Threat Score: 1.7

Threat Vector: CVSS:4.0/E:U

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

Vulnerability Information

CPE: cpe:/o:debian:debian_linux:11.0, p-cpe:/a:debian:debian_linux:liblzma-dev, p-cpe:/a:debian:debian_linux:liblzma5, p-cpe:/a:debian:debian_linux:xz-utils, p-cpe:/a:debian:debian_linux:xzdec

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

Exploit Ease: No known exploits are available

Patch Publication Date: 7/20/2026

Vulnerability Publication Date: 4/2/2026

Reference Information

CVE: CVE-2026-34743