CVE-2026-76957CWE-416

CVE-2026-76957

Medium · published August 20, 2026

CVSS v3.1
4.9
EPSS
0%
Percentile
1.1
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
4.9 · MEDIUM
Vector
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
CVSS v4.0
Not supplied
EPSS
0.00107 · 1.1th percentile
Weakness
CWE-416 · Use After Free
Published
2026-08-20T09:16Z
Affected products (1)
ProductVersionsFixed in
libexpat_project/libexpat< 2.8.42.8.4
References (2)
https://github.com/libexpat/libexpat/pull/1322 · [email protected]https://github.com/libexpat/libexpat/pull/1329 · [email protected]
EPSS history
Timeline
  • 20 AUG 04:28Z
    libexpat before 2.8.4 lacks handler call depth tracking with custom encoding callbacks
    cvelistv5