What is CVE-2026-93990?

CVE-2026-93990 is a security advisory published by Microsoft Security Response Center (MSRC) with High severity. Expat through 2.8.4 Malformed UTF-16 Acceptance via Unchecked Surrogate

Which CVE IDs does CVE-2026-93990 cover?

CVE-2026-93990 covers the following CVE IDs: CVE-2026-93990. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-93990?

CVE-2026-93990 has a CVSS v3 base score of 7.5, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-93990?

CVE-2026-93990 affects 1 product, including: azl3 expat 2.8.3-2 on Azure Linux 3.0.

CVE-2026-93990HighCVSS 7.5

Expat through 2.8.4 Malformed UTF-16 Acceptance via Unchecked Surrogate

Vendor

Microsoft Security Response Center (MSRC)

Published

September 21, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-93990 →

🎯 Affected products1

azl3 expat 2.8.3-2 on Azure Linux 3.0

✅ Remediation

KBRelease Notes (Security Update) — fixed build 2.8.5-1

🔗 References (2)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-93990
referencehttps://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade