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CentOS Linux 8 [TuxCare] Security Update: expat / expat-devel / expat-static Multiple Vulnerabilities (CENTOS-STREAM8:CLSA-2026:1786009697)

medium Nessus Plugin ID 361593

Synopsis

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

Description

The CentOS Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the TuxCare CENTOS-STREAM8:CLSA-2026:1786009697 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 CENTOS-STREAM8:CLSA-2026:1786009697.

See Also

https://cve.tuxcare.com/els/releases/CLSA-2026:1786009697

http://www.nessus.org/u?48b1d4a7

Plugin Details

Severity: Medium

ID: 361593

File Name: tuxcare_centos_8_CLSA-2026-1786009697.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: 2026:1786009697