Incorrect Calculation of Buffer Size Affecting expat package, versions <0:2.5.0-6.el9_8.3


Severity

Recommended
0.0
medium
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.1% (1st percentile)

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  • Snyk IDSNYK-RHEL9-EXPAT-19716575
  • published13 Sept 2026
  • disclosed19 Jun 2026

Introduced: 19 Jun 2026

CVE-2026-56132  (opens in a new tab)
CWE-131  (opens in a new tab)

How to fix?

Upgrade RHEL:9 expat to version 0:2.5.0-6.el9_8.3 or higher.
This issue was patched in RHSA-2026:64812.

NVD Description

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

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.

CVSS Base Scores

version 3.1