What is CVE-2026-56411?

CVE-2026-56411 is a security advisory published by Microsoft Security Response Center (MSRC) with Medium severity. xmlwf in libexpat before 2.8.2 has an integer overflow in endDoctypeDecl via NOTATION declarations.

Which CVE IDs does CVE-2026-56411 cover?

CVE-2026-56411 covers the following CVE IDs: CVE-2026-56411. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-56411?

CVE-2026-56411 has a CVSS v3 base score of 6.9, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-56411?

CVE-2026-56411 affects 1 product, including: azl3 expat 2.6.4-6 on Azure Linux 3.0.

CVE-2026-56411MediumCVSS 6.9

xmlwf in libexpat before 2.8.2 has an integer overflow in endDoctypeDecl via NOTATION declarations.

Vendor

Microsoft Security Response Center (MSRC)

Published

June 30, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-56411 →

🎯 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-2026-56411
referencehttps://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade