CVE-2026-76957

Published: Aug 20, 2026Modified: Sep 8, 2026

7.8

Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Exploitability: 1.8 / Impact: 5.9

Source: NVD

Description

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.

Affected (1)

Products: Libexpat Project: Libexpat

Libexpat Project

1 product

Libexpat

Configuration A

1 vulnerable

Vulnerable Software	Affected Versions
Libexpat Project Libexpat	Before 2.8.4

Related CWEs

CWE-416

Use After Free

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

References (2)

https://github.com/libexpat/libexpat/pull/1322

Source: cve@mitre.org

Issue TrackingPatchVendor Advisory

https://github.com/libexpat/libexpat/pull/1329

Source: cve@mitre.org

Issue TrackingPatch

Timeline

No history available yet.