libexpat <=2.8.2 Use-After-Free via XML_TOK_DATA_CHARS in doCdataSection
CVE-2026-56412 Published on June 21, 2026
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.
Vulnerability Analysis
CVE-2026-56412 is exploitable with local system access, and does not require authorization privileges or user interaction. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to be low. considered to have a small impact on confidentiality and integrity and availability.
Weakness Type
What is a Dangling pointer Vulnerability?
Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code.
CVE-2026-56412 has been classified to as a Dangling pointer vulnerability or weakness.
Products Associated with CVE-2026-56412
Want to know whenever a new CVE is published for Libexpatproject Libexpat? stack.watch will email you.
Affected Versions
libexpat project libexpat:- Before 2.8.2 is affected.