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AlmaLinux 9.6 [TuxCare] Security Update: expat / expat-devel / expat-static Multiple Vulnerabilities (ALMALINUX9.6:CLSA-2026:1784032274)

medium Nessus Plugin ID 352740

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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-2026:1784032274 advisory.

 - In libexpat before 2.8.2, there is a heap-based buffer overflow in doProlog in xmlparse.c because scaffold backing array reallocation is mishandled when there is data-structure sharing across parsers.
 (CVE-2026-56132)

 - libexpat before 2.8.2 has an integer overflow in storeAtts. (CVE-2026-56403)

 - libexpat before 2.8.2 has an integer overflow in addBinding. (CVE-2026-56404)

 - libexpat before 2.8.2 has an integer overflow in getAttributeId. (CVE-2026-56405)

 - libexpat before 2.8.2 has an integer overflow in XML_ParseBuffer because it lacked a check that was present in XML_Parse. (CVE-2026-56406)

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-2026:1784032274.

See Also

https://cve.tuxcare.com/els/releases/CLSA-2026:1784032274

http://www.nessus.org/u?21d3a9d7

Plugin Details

Severity: Medium

ID: 352740

File Name: tuxcare_alma_linux_9.6_CLSA-2026-1784032274.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: 57.56

Vendor

Vendor Severity: Moderate

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-2026-56411

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-2026-56405

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: 7/14/2026

Vulnerability Publication Date: 6/19/2026

Reference Information

CVE: CVE-2026-56132, CVE-2026-56403, CVE-2026-56404, CVE-2026-56405, CVE-2026-56406, CVE-2026-56410, CVE-2026-56411

CLSA: 2026:1784032274