Detections
Analytics
CVE-2026-86143
medium
Description
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.
References
https://gitlab.gnome.org/GNOME/libxml2/-/work_items/1111
https://github.com/GNOME/libxml2/compare/v2.15.3...v2.15.4
https://github.com/GNOME/libxml2/commit/90f293ba74d28b1d570920382e707586f68ebf35