MEDIUM 4.9 Microsoft
CVE-2026-76957
libexpat before 2.8.4 lacks handler call depth tracking with custom encoding callbacks. Thus, a use-after-free can occur. NOTE: this is similar to CVE-2026-50219, CVE-2026-56131 and CVE-2026-56412.
Microsoft Security Update 2026-Aug: libexpat before 2.8.4 lacks handler call depth tracking with custom encoding callbacks. Thus, a use-after-free can occur. NOTE: this is similar to CVE-2026-50219, CVE-2026-56131 and CVE-2026-56412.
Affected Products
- azl3 expat 2.8.2-1 on Azure Linux 3.0
- azl3 cmake 3.30.3-15 on Azure Linux 3.0
- azl3 python3 3.12.9-14 on Azure Linux 3.0
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-76957
- https://nvd.nist.gov/vuln/detail/CVE-2026-76957
This medium severity vulnerability with a CVSS score of 4.9 was published on 2026-08-11 via Microsoft. Affected: azl3 expat 2.8.2-1 on Azure Linux 3.0, azl3 cmake 3.30.3-15 on Azure Linux 3.0, azl3 python3 3.12.9-14 on Azure Linux 3.0.
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