CVE-2026-56131CWE-416

libexpat before 2.8.2 lacks handler call depth tracking for calls to XML_ResumeParser from within handlers in cases of a policy violation

Medium · published June 19, 2026

CVSS v3.1
4.9
EPSS
0%
Percentile
6.7
In the wild
Unconfirmed
What it is

libexpat before 2.8.2 lacks handler call depth tracking for calls to XML_ResumeParser from within handlers in cases of a policy violation. Thus, a use-after-free can occur (similar to the CVE-2026-50219 situation).

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
0.00175 · 6.7th percentile
Weakness
CWE-416 · Use After Free
Published
2026-06-19T02:56Z
EPSS history
Timeline
  • 19 JUN 02:56Z
    libexpat before 2.8.2 lacks handler call depth tracking for calls to XML_ResumeParser from within handlers in cases of a policy violation
    cvelistv5