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AlmaLinux 9.6 [TuxCare] Security Update: expat / expat-devel / expat-static Multiple Vulnerabilities (ALMALINUX9.6:CLSA-2026:1786034306)

medium Nessus Plugin ID 353084

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Synopsis

The AlmaLinux host is missing one or more security updates.

Description

The AlmaLinux 9.6 host has packages installed that are affected by multiple vulnerabilities as referenced in the TuxCare ALMALINUX9.6:CLSA-2026:1786034306 advisory.

 - libexpat before 2.8.2 has an integer overflow in doProlog that is related to storeEntityValue and entity textLen. (CVE-2026-56407)

 - libexpat before 2.8.2 has an integer overflow in copyString. (CVE-2026-56408)

 - xmlwf in libexpat before 2.8.2 has an integer overflow for the output filename when -d outputDir is used.
 (CVE-2026-56409)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Update the affected packages based on the guidance in TuxCare advisory ALMALINUX9.6:CLSA-2026:1786034306.

See Also

https://cve.tuxcare.com/els/releases/CLSA-2026:1786034306

http://www.nessus.org/u?7d121f90

Plugin Details

Severity: Medium

ID: 353084

File Name: tuxcare_alma_linux_9.6_CLSA-2026-1786034306.nasl

Version: 1.1

Type: Local

Published: 9/30/2026

Updated: 9/30/2026

Supported Sensors: Continuous Assessment, Nessus Agent, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.5

Percentile: 57.71

Vendor

Vendor Severity: Important

CVSS v2

Risk Factor: Medium

Base Score: 5.9

Temporal Score: 4.4

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

CVSS Score Source: CVE-2026-56409

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-2026-56408

Vulnerability Information

Required KB Items: Host/OS/extended-third-party, Host/local_checks_enabled, Host/AlmaLinux/release, Host/AlmaLinux/rpm-list, Host/cpu

Exploit Ease: No known exploits are available

Patch Publication Date: 8/6/2026

Vulnerability Publication Date: 6/21/2026

Reference Information

CVE: CVE-2026-56407, CVE-2026-56408, CVE-2026-56409

CLSA: 2026:1786034306