CVE-2026-50219: 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,

Overview

Severity

Medium (CVSS 4.9)

CVSS Vector

CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L/E:U/RL:O/RC:U

Exploit Status

Not Exploited

Patch Tuesday

2026-Jun

Released

2026-06-05

Last Updated

2026-06-29

EPSS Score

0.22% (percentile: 12.4%)

Affected Products (3)

Open Source Software

• azl3 expat 2.6.4-6 on Azure Linux 3.0
• azl3 cmake 3.30.3-13 on Azure Linux 3.0
• azl3 python3 3.12.9-11 on Azure Linux 3.0

Revision History

• 2026-06-05: Information published.
• 2026-06-07: Information published.
• 2026-06-07: Information published.
• 2026-06-09: Information published.
• 2026-06-29: Information published.