CVE-2026-56131

CVSS 4.9 MEDIUMEPSS 0.1%CWE-416

Vexday Risk Score

13Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 4.9EPSS 0.1%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

19 Jun 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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).

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

Affected products

libexpat project · libexpat

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References

https://github.com/libexpat/libexpat/pull/1267