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In libxml2 before 2.15.4, xmlFAParsePosCharGroup has an out-of-bounds read, aka an out-of-bounds read in the NXT macro in xmlregexp.

CVE-2026-86137 affects azl3 libxml2 2.11.5-10 on Azure Linux 3.0. CVSS base score 2.9 (Microsoft Security Response Center). EPSS 0.00195 (percentile 0.08295), scored 2026-10-03. Fixed version: 2.15.4+dfsg-1.

Published 2026-10-05 08:15:50.251038+00:00

CVE

CVE-2026-86137

Product

azl3 libxml2 2.11.5-10 on Azure Linux 3.0

CCR priority

11.6 /100 (P5)

CVSS

2.9 /10 · CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L · Microsoft Security Response Center

EPSS

0.00195 · percentile 0.08279 · 2026-10-04

KEV

no

Affected products

• azl3 libxml2 2.11.5-10 on Azure Linux 3.0
• azl3 libxml2 2.11.5-11 on Azure Linux 3.0
• libxml2 · Fixed version: 2.15.4+dfsg-1

Provenance

• Microsoft MSRC Security Update Guide (CVRF) · Source record · observed 2026-10-04 07:08:49.022374+00:00 UTC
• OSV.dev · Source record · observed 2026-10-04 23:49:35.786600+00:00 UTC
• FIRST EPSS daily exploit-probability · Source record · observed 2026-10-05 08:16:32.814186+00:00 UTC

Stable permalink: https://cybercodered.org/item/cve-cve-2026-86137.html