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.
Published: 2026-08-20
Score: 4.9 Medium
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

Analysis and contextual insights are available on OpenCVE Cloud.

Remediation

No vendor fix or workaround currently provided.

Additional remediation guidance may be available on OpenCVE Cloud.

Tracking

Sign in to view the affected projects.

Advisories

No advisories yet.

History

Thu, 20 Aug 2026 07:45:00 +0000

Type Values Removed Values Added
Title Use-After-Free in libexpat Due to Missing Handler Depth Tracking for Custom Encoding Callbacks

Thu, 20 Aug 2026 04:45:00 +0000

Type Values Removed Values Added
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.
First Time appeared Libexpat Project
Libexpat Project libexpat
Weaknesses CWE-416
CPEs cpe:2.3:a:libexpat_project:libexpat:*:*:*:*:*:*:*:*
Vendors & Products Libexpat Project
Libexpat Project libexpat
References
Metrics cvssV3_1

{'score': 4.9, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L'}

Subscriptions

Libexpat Project Libexpat
cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2026-08-20T04:28:04.788Z

Reserved: 2026-08-20T04:28:04.012Z

Link: CVE-2026-76957

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-08-20T05:16:29.747

Modified: 2026-08-20T05:16:29.747

Link: CVE-2026-76957

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-20T07:30:03Z

Weaknesses