CVE-2026-56131: Libexpat Project Libexpat

Medium severity, CVSS 4.9. EPSS: 0.2% chance of exploitation in the next 30 days.

libexpat before 2.8.2 lacks handler call depth tracking for calls to XML_ResumeParser from within handlers in cases of a policy violation. Thus, a use-after-free can occur (similar to the CVE-2026-50219 situation).

Affected products

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

Published 2026-06-19. Last modified 2026-06-23.