What is CVE-2026-86003?

CVE-2026-86003 is a security advisory published by Microsoft Security Response Center (MSRC) with Medium severity. CoreDNS DoH/DoQ/gRPC bypass UPDATE rejection enforced on UDP/TCP

Which CVE IDs does CVE-2026-86003 cover?

CVE-2026-86003 covers the following CVE IDs: CVE-2026-86003. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-86003?

CVE-2026-86003 has a CVSS v3 base score of 5.9, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-86003?

CVE-2026-86003 affects 2 products, including: azl3 coredns 1.11.4-20 on Azure Linux 3.0; azl3 coredns 1.11.4-21 on Azure Linux 3.0.

CVE-2026-86003MediumCVSS 5.9

CoreDNS DoH/DoQ/gRPC bypass UPDATE rejection enforced on UDP/TCP

Vendor

Microsoft Security Response Center (MSRC)

Published

September 18, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-86003 →

🎯 Affected products2

azl3 coredns 1.11.4-20 on Azure Linux 3.0
azl3 coredns 1.11.4-21 on Azure Linux 3.0

✅ Remediation

Security Update KBRelease Notes (Security Update)

🔗 References (2)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-86003
patchhttps://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade