Out-of-bounds Read Affecting expat package, versions <2.4.7-1ubuntu0.9


Severity

Recommended
medium

Based on Ubuntu security rating.

Threat Intelligence

EPSS
0.19% (8th percentile)

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  • Snyk IDSNYK-UBUNTU2204-EXPAT-18741604
  • published5 Sept 2026
  • disclosed10 Aug 2026

Introduced: 10 Aug 2026

CVE-2026-72522  (opens in a new tab)
CWE-125  (opens in a new tab)

How to fix?

Upgrade Ubuntu:22.04 expat to version 2.4.7-1ubuntu0.9 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream expat package and not the expat package as distributed by Ubuntu. See How to fix? for Ubuntu:22.04 relevant fixed versions and status.

libexpat before 2.8.3 has an out-of-bounds read and resultant infinite loop because low surrogates are treated the same as high surrogates during Unicode processing in the *_toUtf16 functions.

CVSS Base Scores

version 3.1