CVE-2026-86142

Description

In libxml2 before 2.15.4, there is a heap-based buffer overflow in xmlXPtrEvalXPtrPart because of xmlXPtrEval xpointer length saturation.

References

• https://github.com/GNOME/libxml2/commit/6b3a736c0edc74ceec3d82f5252499d7911b3a58
• https://github.com/GNOME/libxml2/compare/v2.15.3...v2.15.4
• https://gitlab.gnome.org/GNOME/libxml2/-/work_items/1113