libexpat UA Free prior to 2.8.4 via custom encode callback
CVE-2026-76957 Published on August 20, 2026
libexpat before 2.8.4 lacks handler call depth tracking with custom encoding callbacks. Thus, a use-after-free can occur. NOTE: this is similar to CVE-2026-50219, CVE-2026-56131 and CVE-2026-56412.
Vulnerability Analysis
CVE-2026-76957 can be exploited 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-2026-76957 has been classified to as a Dangling pointer vulnerability or weakness.
Products Associated with CVE-2026-76957
stack.watch emails you whenever new vulnerabilities are published in Libexpatproject Libexpat or Canonical Ubuntu Linux. Just hit a watch button to start following.
Affected Versions
libexpat project libexpat:- Before 2.8.4 is affected.