What is CVE-2026-56406?

CVE-2026-56406 is a security advisory published by Microsoft Security Response Center (MSRC) with Medium severity. libexpat before 2.8.2 has an integer overflow in XML_ParseBuffer because it lacked a check that was present in XML_Parse.

Which CVE IDs does CVE-2026-56406 cover?

CVE-2026-56406 covers the following CVE IDs: CVE-2026-56406. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-56406?

CVE-2026-56406 has a CVSS v3 base score of 6.9, published by Microsoft Security Response Center (MSRC).

CVE-2026-56406MediumCVSS 6.9

libexpat before 2.8.2 has an integer overflow in XML_ParseBuffer because it lacked a check that was present in XML_Parse.

Vendor

Microsoft Security Response Center (MSRC)

Published

June 30, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-56406 →