VULNERABILITY INTELLIGENCE

CVE-2026-76957

CVSS score4.9 MEDIUM

EPSS probability0.11%

CISA KEVNot currently listed

Published2026-08-20

Last modified2026-09-08

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

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.

Weakness classification

cve@mitre.org: CWE-416

Primary references

cve@mitre.org — Issue Tracking, Patch, Vendor Advisory
cve@mitre.org — Issue Tracking, Patch