CVE-2026-86139

high

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

Vendor / product: Xmlsoft — libxml2

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

CVSS

7.8

7.8 (CVSS v3.1)

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

Severity source: NVD CVSS v3.1 (nvd@nist.gov)

Timeline (UTC)

Published: 2026-09-05 05:17

Modified: 2026-09-15 19:39

NVD status: Analyzed

Last synced 1 day ago

Verified against the source API 2026-10-27 06:50 UTC

Exploitation

Not listed in CISA KEV (as of last catalog sync)

Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).

Affected products

xmlsoft / libxml2 <2.15.4

Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.

NVD CVE API 2.0 — fetched 2026-10-27 06:50 UTC · record ↗