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CentOS Linux 8.4 [TuxCare] Security Update: expat / expat-devel / expat-static Multiple Vulnerabilities (CENTOS8.4:CLSA-2026:1786009371)

medium Nessus Plugin ID 361446

Synopsis

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

Description

The CentOS Linux 8.4 host has packages installed that are affected by multiple vulnerabilities as referenced in the TuxCare CENTOS8.4:CLSA-2026:1786009371 advisory.

 - libexpat before 2.8.2 lacks handler call depth tracking for calls to XML_ResumeParser from within handlers in cases of a policy violation. Thus, a use-after-free can occur (similar to the CVE-2026-50219 situation). (CVE-2026-56131)

 - 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)

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 CENTOS8.4:CLSA-2026:1786009371.

See Also

https://cve.tuxcare.com/els/releases/CLSA-2026:1786009371

http://www.nessus.org/u?3f44a64e

Plugin Details

Severity: Medium

ID: 361446

File Name: tuxcare_centos_8.4_CLSA-2026-1786009371.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 10/1/2026

Updated: 10/1/2026

Supported Sensors: Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.5

Percentile: 57.71

Vendor

Vendor Severity: Critical

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-2026-56408

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

Vulnerability Information

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

Exploit Ease: No known exploits are available

Patch Publication Date: 8/6/2026

Vulnerability Publication Date: 6/19/2026

Reference Information

CVE: CVE-2026-56131, CVE-2026-56407, CVE-2026-56408

CLSA: 2026:1786009371