CVE-2026-86143

HighCVSS 7.3/10Last modified Sep 15, 2026

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.

Metrics

CVSS 3.1 7.3/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L

Weakness enumeration

CWE-192

Affected software

Vendor	Product	Versions
xmlsoft	libxml2	< 2.15.4

References

https://github.com/GNOME/libxml2/commit/90f293ba74d28b1d570920382e707586f68ebf35Patch
https://github.com/GNOME/libxml2/compare/v2.15.3...v2.15.4Release Notes
https://gitlab.gnome.org/GNOME/libxml2/-/work_items/1111Exploit, Vendor Advisory

Timeline

Published: Sep 5, 2026
Last modified: Sep 15, 2026
NVD status: Analyzed

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