MEDIUM 4.9 Microsoft
CVE-2026-56131
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).
Microsoft Security Update 2026-Jun: 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).
Affected Products
- azl3 cmake 3.30.3-13 on Azure Linux 3.0
- azl3 cmake 3.30.3-14 on Azure Linux 3.0
- azl3 python3 3.12.9-13 on Azure Linux 3.0
- azl3 expat 2.6.4-6 on Azure Linux 3.0
- azl3 python3 3.12.9-11 on Azure Linux 3.0
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56131
- https://nvd.nist.gov/vuln/detail/CVE-2026-56131
This medium severity vulnerability with a CVSS score of 4.9 was published on 2026-06-09 via Microsoft. Affected: azl3 cmake 3.30.3-13 on Azure Linux 3.0, azl3 cmake 3.30.3-14 on Azure Linux 3.0, azl3 python3 3.12.9-13 on Azure Linux 3.0 and 2 more.
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