Integer Overflow or Wraparound Affecting libxml2 package, versions <0:2.9.13-14.el9_8.5


Severity

Recommended
high

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.13% (3rd percentile)

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  • Snyk IDSNYK-RHEL9-LIBXML2-20139279
  • published25 Sept 2026
  • disclosed5 Sept 2026

Introduced: 5 Sep 2026

CVE-2026-86138  (opens in a new tab)
CWE-190  (opens in a new tab)

How to fix?

Upgrade RHEL:9 libxml2 to version 0:2.9.13-14.el9_8.5 or higher.
This issue was patched in RHSA-2026:71585.

NVD Description

Note: Versions mentioned in the description apply only to the upstream libxml2 package and not the libxml2 package as distributed by RHEL. See How to fix? for RHEL:9 relevant fixed versions and status.

In libxml2 before 2.15.4, xmlDictAddQString in dict.c has an integer overflow and resultant heap-based buffer overflow.

CVSS Base Scores

version 3.1