What is CVE-2026-86137?

CVE-2026-86137 is a security advisory published by Microsoft Security Response Center (MSRC) with Low severity. 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.

Which CVE IDs does CVE-2026-86137 cover?

CVE-2026-86137 covers the following CVE IDs: CVE-2026-86137. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-86137?

CVE-2026-86137 has a CVSS v3 base score of 2.9, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-86137?

CVE-2026-86137 affects 2 products, including: azl3 libxml2 2.11.5-10 on Azure Linux 3.0; azl3 libxml2 2.11.5-11 on Azure Linux 3.0.

CVE-2026-86137LowCVSS 2.9

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.

Vendor

Microsoft Security Response Center (MSRC)

Published

September 11, 2026

Last Modified

—

🔗 CVE IDs covered (1)

CVE-2026-86137 →

🎯 Affected products2

azl3 libxml2 2.11.5-10 on Azure Linux 3.0
azl3 libxml2 2.11.5-11 on Azure Linux 3.0

✅ Remediation

Security Update — fixed build 2.11.5-11

🔗 References (2)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-86137
patchhttps://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade