CVE-2026-56412

Name: CVE-2026-56412
Creator: NVD / NIST
Published: 2026-06-21T17:16:44.657+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.9/10EPSS 0.10%

Last modified Jun 23, 2026

CVE-2026-56412 is a medium-severity vulnerability rated 5.9/10 on the CVSS scale. 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. EPSS estimates a 0.10% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

5.9/10

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

EPSS Probability

0.10%

1.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-416

Affected Software

Vendor	Product	Versions
Libexpat Project	Libexpat	< 2.8.2

References

https://github.com/libexpat/libexpat/pull/1278Patch, Issue Tracking

Timeline

Published: Jun 21, 2026
Last Modified: Jun 23, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-56412?

How severe is CVE-2026-56412?

CVE-2026-56412 has a CVSS score of 5.9/10 (MEDIUM severity). The EPSS model estimates a 0.10% probability of exploitation in the next 30 days.

How do I fix CVE-2026-56412?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-56412?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST