CVE-2026-86003: CoreDNS DoH/DoQ/gRPC bypass UPDATE rejection enforced on UDP/TCP

Overview

Severity

Medium (CVSS 5.9)

CVSS Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

Exploit Status

Not Exploited

Patch Tuesday

2026-Sep

Released

2026-09-18

Affected Products (1)

Other

• 21687-17084

Security Updates (1)

• Security Update

Revision History

• 2026-09-18: Information published.