What is CVE-2026-45186?

CVE-2026-45186 is a security advisory published by Microsoft Security Response Center (MSRC) with Low severity. In libexpat before 2.8.1, the computational complexity of attribute name collision checks allows a denial of service via moderately sized crafted XML input.

Which CVE IDs does CVE-2026-45186 cover?

CVE-2026-45186 covers the following CVE IDs: CVE-2026-45186. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-45186?

CVE-2026-45186 has a CVSS v3 base score of 2.9, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-45186?

CVE-2026-45186 affects 1 product, including: azl3 expat 2.6.4-6 on Azure Linux 3.0.

CVE-2026-45186LowCVSS 2.9

In libexpat before 2.8.1, the computational complexity of attribute name collision checks allows a denial of service via moderately sized crafted XML input.

Vendor

Microsoft Security Response Center (MSRC)

Published

May 22, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-45186 →

🎯 Affected products1

azl3 expat 2.6.4-6 on Azure Linux 3.0

✅ Remediation

KBCBL-Mariner Releases (Security Update) — fixed build 2.8.2-1

🔗 References (2)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45186
referencehttps://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade