What is CVE-2026-86138?

CVE-2026-86138 is a security advisory published by Microsoft Security Response Center (MSRC) with Medium severity. In libxml2 before 2.15.4, xmlDictAddQString in dict.c has an integer overflow and resultant heap-based buffer overflow.

Which CVE IDs does CVE-2026-86138 cover?

CVE-2026-86138 covers the following CVE IDs: CVE-2026-86138. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-86138?

CVE-2026-86138 has a CVSS v3 base score of 6.9, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-86138?

CVE-2026-86138 affects 1 product, including: azl3 libxml2 2.11.5-10 on Azure Linux 3.0.

CVE-2026-86138MediumCVSS 6.9

In libxml2 before 2.15.4, xmlDictAddQString in dict.c has an integer overflow and resultant heap-based buffer overflow.

Vendor

Microsoft Security Response Center (MSRC)

Published

September 11, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-86138 →

🎯 Affected products1

azl3 libxml2 2.11.5-10 on Azure Linux 3.0

✅ Remediation

Security Update

🔗 References (2)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-86138
patchhttps://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade