🛡️ CVE-2026-33190
🟠 CVSS 8.0 — High ⚠️ Exploit Public CWE-303 NVD
8.0
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

Details

Severity HIGH
CVSS Score 8.0
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CWE CWE-303
Public Exploit ⚠️ Yes
Source NVD
Published 2026-05-05
Updated 2026-06-02
Modified 2026-05-08
Fix URL N/A

Affected Packages

Software From version Fixed in
coredns — 1.14.3
github.com/coredns/coredns — —
unknown — —

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