Description

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.

INFO

Published Date :

2026-05-05T19:02:55.374Z

Last Modified :

2026-05-06T12:47:07.338Z

Source :

GitHub_M
AFFECTED PRODUCTS

The following products are affected by CVE-2026-33190 vulnerability.

Vendors Products
Coredns.io
  • Coredns
REFERENCES

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-33190.

URL Resource
https://github.com/coredns/coredns/releases/tag/v1.14.3 cve-icon cve-icon
https://github.com/coredns/coredns/security/advisories/GHSA-qhmp-q7xh-99rh cve-icon cve-icon cve-icon
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