CVE-2026-56412: Libexpat Project Libexpat

Medium severity, CVSS 5.9. EPSS: 0.2% chance of exploitation in the next 30 days.

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.

Affected products

• Libexpat Project Libexpat: before 2.8.2 (fixed in 2.8.2)

Published 2026-06-21. Last modified 2026-06-23.