CVE-2026-86142

CVE-2026-86142

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

Vulnerability class: Buffer Overflow

CVSS v3 metric

CVSS v3 base score 6.9 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L.

Weakness classification (CWE)

CWE-122 — Heap-based Buffer Overflow

References

Frequently asked questions

What is CVE-2026-86142?: CVE-2026-86142 is a medium-severity vulnerability, classified under Heap-based Buffer Overflow. CVSS score: 6.9/10. Published 2026-09-05.
How severe is CVE-2026-86142?: Medium severity. CVSS v3 base score is 6.9 out of 10.