CVE-2026-86139

CVE-2026-86139

In libxml2 before 2.15.4, xmlURIEscapeStr in uri.c has an integer overflow.

Vulnerability class: Integer 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-190 — Integer Overflow or Wraparound

References

Frequently asked questions

What is CVE-2026-86139?: CVE-2026-86139 is a medium-severity vulnerability, classified under Integer Overflow or Wraparound. CVSS score: 6.9/10. Published 2026-09-05.
How severe is CVE-2026-86139?: Medium severity. CVSS v3 base score is 6.9 out of 10.