Vulnerability Details CVE-2026-33190
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 24.6%
CVSS Severity
CVSS v3 Score 7.5
References
Products affected by CVE-2026-33190
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cpe:2.3:a:coredns.io:coredns:-
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cpe:2.3:a:coredns.io:coredns:0.9.10
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cpe:2.3:a:coredns.io:coredns:0.9.9
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cpe:2.3:a:coredns.io:coredns:001
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cpe:2.3:a:coredns.io:coredns:1.0.0
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cpe:2.3:a:coredns.io:coredns:1.0.1
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cpe:2.3:a:coredns.io:coredns:1.0.2
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cpe:2.3:a:coredns.io:coredns:1.0.3
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cpe:2.3:a:coredns.io:coredns:1.0.4
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cpe:2.3:a:coredns.io:coredns:1.0.5
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cpe:2.3:a:coredns.io:coredns:1.0.6
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cpe:2.3:a:coredns.io:coredns:1.1.0
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cpe:2.3:a:coredns.io:coredns:1.1.1
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cpe:2.3:a:coredns.io:coredns:1.1.2
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cpe:2.3:a:coredns.io:coredns:1.1.3
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cpe:2.3:a:coredns.io:coredns:1.1.4
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cpe:2.3:a:coredns.io:coredns:1.10.0
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cpe:2.3:a:coredns.io:coredns:1.10.1
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cpe:2.3:a:coredns.io:coredns:1.11.0
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cpe:2.3:a:coredns.io:coredns:1.11.1
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cpe:2.3:a:coredns.io:coredns:1.11.3
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cpe:2.3:a:coredns.io:coredns:1.11.4
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cpe:2.3:a:coredns.io:coredns:1.12.0
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cpe:2.3:a:coredns.io:coredns:1.12.1
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cpe:2.3:a:coredns.io:coredns:1.12.2
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cpe:2.3:a:coredns.io:coredns:1.12.3
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cpe:2.3:a:coredns.io:coredns:1.12.4
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cpe:2.3:a:coredns.io:coredns:1.13.0
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cpe:2.3:a:coredns.io:coredns:1.13.1
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cpe:2.3:a:coredns.io:coredns:1.2.0
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cpe:2.3:a:coredns.io:coredns:1.2.1
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cpe:2.3:a:coredns.io:coredns:1.2.2
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cpe:2.3:a:coredns.io:coredns:1.2.3
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cpe:2.3:a:coredns.io:coredns:1.2.4
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cpe:2.3:a:coredns.io:coredns:1.2.5
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cpe:2.3:a:coredns.io:coredns:1.2.6
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cpe:2.3:a:coredns.io:coredns:1.3.0
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cpe:2.3:a:coredns.io:coredns:1.3.1
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cpe:2.3:a:coredns.io:coredns:1.4.0
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cpe:2.3:a:coredns.io:coredns:1.5.0
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cpe:2.3:a:coredns.io:coredns:1.5.1
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cpe:2.3:a:coredns.io:coredns:1.5.2
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cpe:2.3:a:coredns.io:coredns:1.6.0
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cpe:2.3:a:coredns.io:coredns:1.6.1
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cpe:2.3:a:coredns.io:coredns:1.6.2
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cpe:2.3:a:coredns.io:coredns:1.6.3
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cpe:2.3:a:coredns.io:coredns:1.6.4
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cpe:2.3:a:coredns.io:coredns:1.6.5
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cpe:2.3:a:coredns.io:coredns:1.6.6
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cpe:2.3:a:coredns.io:coredns:1.6.7
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cpe:2.3:a:coredns.io:coredns:1.6.8
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cpe:2.3:a:coredns.io:coredns:1.6.9
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cpe:2.3:a:coredns.io:coredns:1.7.0
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cpe:2.3:a:coredns.io:coredns:1.7.1
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cpe:2.3:a:coredns.io:coredns:1.8.0
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cpe:2.3:a:coredns.io:coredns:1.8.1
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cpe:2.3:a:coredns.io:coredns:1.8.2
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cpe:2.3:a:coredns.io:coredns:1.8.3
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cpe:2.3:a:coredns.io:coredns:1.8.4
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cpe:2.3:a:coredns.io:coredns:1.8.5
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cpe:2.3:a:coredns.io:coredns:1.8.6
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cpe:2.3:a:coredns.io:coredns:1.8.7
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cpe:2.3:a:coredns.io:coredns:1.9.0
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cpe:2.3:a:coredns.io:coredns:1.9.1
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cpe:2.3:a:coredns.io:coredns:1.9.2
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cpe:2.3:a:coredns.io:coredns:1.9.3
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cpe:2.3:a:coredns.io:coredns:1.9.4