MEDIUM 4.9 Microsoft

CVE-2026-56412

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.

Microsoft Security Update 2026-Jun: 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.

Affected Products

References

Published: 2026-06-09 · Source: Microsoft · Feed updated: 2026-08-14
This medium severity vulnerability with a CVSS score of 4.9 was published on 2026-06-09 via Microsoft. Affected: azl3 cmake 3.30.3-14 on Azure Linux 3.0, azl3 expat 2.6.4-6 on Azure Linux 3.0, azl3 cmake 3.30.3-13 on Azure Linux 3.0 and 2 more.
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