What is CVE-2026-21863?

CVE-2026-21863 is a security advisory published by Microsoft Security Response Center (MSRC) with High severity. Malformed Valkey Cluster bus message can lead to Remote DoS

Which CVE IDs does CVE-2026-21863 cover?

CVE-2026-21863 covers the following CVE IDs: CVE-2026-21863. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-21863?

CVE-2026-21863 has a CVSS v3 base score of 7.5, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-21863?

CVE-2026-21863 affects 1 product, including: azl3 valkey 8.0.6-1 on Azure Linux 3.0.

CVE-2026-21863HighCVSS 7.5

Malformed Valkey Cluster bus message can lead to Remote DoS

Vendor

Microsoft Security Response Center (MSRC)

Published

February 26, 2026

Last Modified

—

🔗 CVE IDs covered (1)

CVE-2026-21863 →

🎯 Affected products1

azl3 valkey 8.0.6-1 on Azure Linux 3.0

✅ Remediation

KBCBL-Mariner Releases (Security Update) — fixed build 8.0.7-1

🔗 References (2)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21863
referencehttps://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade