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Vulnerability IntelligenceCVE-2026-56412

CVE-2026-56412

MEDIUM4.9

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

Published Jun 21, 2026

Modified 2 months ago

Details

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.

References

https://github.com/libexpat/libexpat/pull/1278

https://www.cve.org/CVERecord?id=CVE-2026-56412

CVSS Analysis

CVSS v3.1

4.9

Exploitability

Attack Vector

LocalAV:L

Attack Complexity

HighAC:H

Privileges Required

NonePR:N

User Interaction

NoneUI:N

Scope

Scope

UnchangedS:U

Impact

Confidentiality

LowC:L

Integrity

LowI:L

Availability

LowA:L

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

Weakness Type (CWE)

Memory Safety

Ecosystems

Timeline

PublishedJun 21, 2026

ModifiedJun 22, 2026

CVE-2026-56412 | Mondoo Vulnerability Intelligence