HIGHVulnerability
Verified
Global

NVD HIGH: CVE-2026-33190 — CoreDNS is a DNS server that chains plugins. In versions prior to 1.14.3, the ts...

·Source: NIST NVD

Updated:

Executive Summary

CoreDNS is a DNS server that chains plugins. In versions prior to 1.14.3, the tsig plugin can be bypassed on non-plain-DNS transports (DoT, DoH, DoH3, DoQ, and gRPC) because it trusts the transport writer's TsigStatus() instead of performing verification itself. The DoH and DoH3 writer's TsigStatus() always returns nil, the DoT server does not set TsigSecret on the dns.Server, and the DoQ and gRPC

Analysis

CoreDNS is a DNS server that chains plugins. In versions prior to 1.14.3, the tsig plugin can be bypassed on non-plain-DNS transports (DoT, DoH, DoH3, DoQ, and gRPC) because it trusts the transport writer's TsigStatus() instead of performing verification itself. The DoH and DoH3 writer's TsigStatus() always returns nil, the DoT server does not set TsigSecret on the dns.Server, and the DoQ and gRPC writers also unconditionally return nil. This allows an unauthenticated remote client to bypass TSIG-based authentication and access resources intended to be restricted behind a tsig require all policy. Plain DNS over TCP and UDP are not affected. This issue has been fixed in version 1.14.3. CVSS Score: 7.5. Published: 2026-05-05T20:16:36.167.

Indicators of Compromise (1)

CVE (1)
CVE-2026-33190
NVDMITRE CVE
Source Attribution

Originally published by NIST NVD on May 5, 2026. Verified by: NIST.

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