{"cve":"CVE-2026-33190","nvd":{"published":"2026-05-05T20:16:36.167","modified":"2026-07-24T23:10:00.563","status":"Analyzed","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.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","score":8.7},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","score":7.5},"cwes":["CWE-303"],"references":["https://github.com/coredns/coredns/releases/tag/v1.14.3","https://github.com/coredns/coredns/security/advisories/GHSA-qhmp-q7xh-99rh","https://github.com/coredns/coredns/security/advisories/GHSA-qhmp-q7xh-99rh"],"products":["coredns.io:coredns"],"source":"nvd","synced_at":"2026-10-19T22:33:55.586217763+00:00"},"epss":{"cve":"CVE-2026-33190","score":0.00374,"percentile":0.31407,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-qhmp-q7xh-99rh","url":"https://osv.dev/vulnerability/GHSA-qhmp-q7xh-99rh","summary":"CoreDNS has TSIG authentication bypass on DoT, DoH, DoH3, DoQ, and gRPC","modified":"2026-09-10T03:51:02.923564531Z","packages":[{"ecosystem":"Go","name":"github.com/coredns/coredns","purl":"pkg:golang/github.com/coredns/coredns","ranges":["<1.14.3"],"fixed":["1.14.3"]}]},{"id":"GO-2026-5583","url":"https://osv.dev/vulnerability/GO-2026-5583","summary":"CoreDNS has TSIG authentication bypass on DoT, DoH, DoH3, DoQ, and gRPC in github.com/coredns/coredns","modified":"2026-06-25T23:01:32.249133398Z","packages":[{"ecosystem":"Go","name":"github.com/coredns/coredns","purl":"pkg:golang/github.com/coredns/coredns","ranges":["<1.14.3"],"fixed":["1.14.3"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}