Use After Free Affecting expat package, versions <2.8.2-r0


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.22% (13th percentile)

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  • Snyk IDSNYK-ALPINE323-EXPAT-17675120
  • published29 Jun 2026
  • disclosed4 Jun 2026

Introduced: 4 Jun 2026

CVE-2026-50219  (opens in a new tab)
CWE-416  (opens in a new tab)

How to fix?

Upgrade Alpine:3.23 expat to version 2.8.2-r0 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 Alpine. See How to fix? for Alpine:3.23 relevant fixed versions and status.

libexpat before 2.8.2 lacks handler call depth tracking for calls to XML_GetBuffer, XML_Parse, XML_ParseBuffer, XML_ParserFree, or XML_ParserReset from within handlers in cases of a policy violation. Thus, a use-after-free can occur,

CVSS Base Scores

version 3.1