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Microsoft Security Response CenterCVE-2026-86003

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

Mariner

Read the vendor bulletin Get alerts for azl3 coredns 1.11.4-20 on Azure Linux
5.9CVSS out of 10Medium severity
Scope

What the vendor says is affected

  • azl3 coredns 1.11.4-20 on Azure Linux 3.0
  • azl3 coredns 1.11.4-21 on Azure Linux 3.0
Next step

What the vendor recommends

Release Notes

Review the complete instructions on the vendor's site
Timeline

When this advisory changed

  1. Published by Microsoft Security Response Center

    The publication date reported by the vendor.

  2. Updated by Microsoft Security Response Center

    The vendor changed the advisory after it was first published.

  3. Added to SecurityAlert

    We collected the advisory from the official source.

Vulnerabilities

CVEs named in this advisory

CVE-2026-86003View CVSS, KEV, EPSS, and threat context
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