MEDIUM 6.9 Microsoft
CVE-2026-86143
In xmlIO in libxml2 before 2.15.4, an inconsistency in xmlOutputWriteCallback and xmlBufUse causes negative lengths to reach write callbacks, aka a lack of a check for integer overflow before calling writecallback. This has security relevance for many types of uses of that length value within a callback.
Microsoft Security Update 2026-Sep: In xmlIO in libxml2 before 2.15.4, an inconsistency in xmlOutputWriteCallback and xmlBufUse causes negative lengths to reach write callbacks, aka a lack of a check for integer overflow before calling writecallback. This has security relevance for many types of uses of that length value within a callback.
Affected Products
- azl3 libxml2 2.11.5-10 on Azure Linux 3.0
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-86143
- https://nvd.nist.gov/vuln/detail/CVE-2026-86143
This medium severity vulnerability with a CVSS score of 6.9 was published on 2026-09-08 via Microsoft. Affected: azl3 libxml2 2.11.5-10 on Azure Linux 3.0.
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