CVE-2026-86143CWE-192

CVE-2026-86143

Medium · published September 5, 2026

CVSS v3.1
6.9
EPSS
0%
Percentile
8.6
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.9 · MEDIUM
Vector
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L
CVSS v4.0
Not supplied
EPSS
0.00194 · 8.6th percentile
Weakness
CWE-192 · Integer Coercion Error
Published
2026-09-05T09:17Z
Affected products (1)
ProductVersionsFixed in
xmlsoft/libxml2< 2.15.42.15.4
References (3)
https://github.com/GNOME/libxml2/commit/90f293ba74d28b1d570920382e707586f68ebf35 · [email protected]https://github.com/GNOME/libxml2/compare/v2.15.3...v2.15.4 · [email protected]https://gitlab.gnome.org/GNOME/libxml2/-/work_items/1111 · [email protected]
EPSS history
Timeline
  • 06 SEP 03:33Z
    EPSS moved — → 0%
    epss
  • 05 SEP 04:31Z
    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…
    cvelistv5