libexpat before 2.8.2 does not consider XML_TOK_DATA_CHARS in doCdataSection and thus lacks handler call depth tracking for various calls from within handlers in cases of a policy violation. Thus, a use-after-free can occur. NOTE: this issue exists because of an incomplete fix for CVE-2026-50219.

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Advisories
Source ID Title
Debian DSA Debian DSA DSA-6404-1 expat security update
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Tue, 23 Jun 2026 12:15:00 +0000

Type Values Removed Values Added
Title Use-After-Free Vulnerability in libexpat Due to Missing Depth Tracking libexpat: libexpat: Use-after-free vulnerability due to improper handling of XML CDATA sections
Weaknesses CWE-825
References
Metrics threat_severity

None

threat_severity

Moderate


Mon, 22 Jun 2026 17:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Sun, 21 Jun 2026 18:45:00 +0000

Type Values Removed Values Added
Title Use-After-Free Vulnerability in libexpat Due to Missing Depth Tracking

Sun, 21 Jun 2026 16:45:00 +0000

Type Values Removed Values Added
Description libexpat before 2.8.2 does not consider XML_TOK_DATA_CHARS in doCdataSection and thus lacks handler call depth tracking for various calls from within handlers in cases of a policy violation. Thus, a use-after-free can occur. NOTE: this issue exists because of an incomplete fix for CVE-2026-50219.
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'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2026-06-22T16:31:06.166Z

Reserved: 2026-06-21T15:58:58.955Z

Link: CVE-2026-56412

cve-icon Vulnrichment

Updated: 2026-06-22T16:31:02.986Z

cve-icon NVD

No data.

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-06-21T15:58:59Z

Links: CVE-2026-56412 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-06-23T14:15:04Z

Weaknesses