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Unity Linux 20.1070e Security Update: libxml2 (UTSA-2026-099459)

low Nessus Plugin ID 336337

Synopsis

The Unity Linux host is missing one or more security updates.

Description

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-099459 advisory.

 libxml2 is vulnerable to multiple stack-based buffer overflows in the xmlcatalog utility when running in
 --shell mode. The usershell() function processes user input using fixed-size stack buffers without proper bounds checking.
 By supplying an overly long input line, an attacker can overflow internal buffers (command, arg, and argv) during input parsing. This results in memory corruption within the stack frame.
 Successful exploitation may cause a crash or potentially allow arbitrary code execution in the context of the xmlcatalog process.

 This issue has been fixed in the commit c2e233fc.

 NOTE:
 The maintainers of this project did not agree that this issue is a vulnerability and considered it a bug.

Tenable has extracted the preceding description block directly from the Unity Linux 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

Update the affected libxml2 package.

See Also

https://atomgit.com/src-openeuler/libxml2/issues/132

https://nvd.nist.gov/vuln/detail/CVE-2026-11979

http://www.nessus.org/u?2c21c471

Plugin Details

Severity: Low

ID: 336337

File Name: unity_linux_UTSA-2026-099459.nasl

Version: 1.1

Type: Local

Published: 8/17/2026

Updated: 8/17/2026

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: High

Score: 7.6

Percentile: 98.44

CVSS v2

Risk Factor: High

Base Score: 7.2

Temporal Score: 5.3

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

CVSS Score Source: CVE-2026-11979

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.8

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

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

CVSS v4

Risk Factor: Low

Base Score: 1.8

Threat Score: 0.2

Threat Vector: CVSS:4.0/E:U

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

Vulnerability Information

Required KB Items: Host/local_checks_enabled, Host/cpu, Host/UOS-Server/release, Host/UOS-Server/rpm-list

Exploit Ease: No known exploits are available

Patch Publication Date: 8/10/2026

Vulnerability Publication Date: 6/29/2026

Reference Information

CVE: CVE-2026-11979