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libexpat before 2.8.2 does not consider XML_TOK_DATA_CHARS in doCdataSection and thus lacks handler call depth tracking for various calls from within handlers in cases of a policy violation. Thus, a use-after-free can occur. NOTE: this issue exists because of an incomplete fix for CVE-2026-50219.

🗓️ 27 Jun 2026 08:07:14Reported by MicrosoftType 
mscve
 mscve
🔗 msrc.microsoft.com👁 24 Views

Libexpat before 2.8.2 mishandles CDATA chars and lacks handler depth, causing use-after-free.

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03 Jul 2026 08:07Current
5.8Medium risk
Vulners AI Score5.8
CVSS 3.14.9 - 5.9
EPSS0.00218
SSVC
24