{"id":"EUVD-2026-80989","enisaUuid":"92452484-cb4c-3fb6-b526-127600ecde5c","description":"CoreDNS is a DNS server written in Go. Prior to 1.14.7, the DNS-over-HTTPS, DNS-over-HTTP/3, DNS-over-QUIC, and DNS-over-gRPC listeners in plugin/pkg/doh/doh.go, core/dnsserver/server_quic.go, and core/dnsserver/server_grpc.go call dns.Msg.Unpack without the dns.DefaultMsgAcceptFunc request policy used by UDP, TCP, and DNS-over-TLS. An unauthenticated client can send an RFC 2136 UPDATE that the proxy or forward plugin passes unchanged to an update-capable upstream. If that upstream trusts CoreDNS\u0027s source address or connection and does not require an attacker-unknown end-to-end TSIG, the request appears to originate from CoreDNS and can add, replace, or delete DNS records, redirect traffic, take over names, alter mail routing, or disrupt the writable zone. This issue is fixed in version 1.14.7.","datePublished":"Sep 16, 2026, 6:39:22 PM","dateUpdated":"Sep 17, 2026, 7:25:42 PM","baseScore":7.5,"baseScoreVersion":"3.1","baseScoreVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","references":"https://github.com/coredns/coredns/security/advisories/GHSA-9gm5-9rfh-m6vx\nhttps://github.com/coredns/coredns/commit/530b0a5ff2ad68cc0421f10dd93568945cc671c9\nhttps://github.com/coredns/coredns/releases/tag/v1.14.7\n","aliases":"CVE-2026-86003\nGHSA-9gm5-9rfh-m6vx\n","assigner":"GitHub_M","epss":0.44,"enisaIdProduct":[{"id":"922486e9-d54b-3949-9d90-c77374bf88e4","product":{"name":"coredns","vendor":{"name":"coredns"}},"product_version":"\u003c 1.14.7"}],"enisaIdVendor":[{"id":"f9c83f0f-eded-3987-a34a-17b2776530d9","vendor":{"name":"coredns"}}],"enisaIdVulnerability":[{"id":"62043a6f-3535-3576-85cc-bdc603165369","vulnerability":{"id":"CVE-2026-86003","description":"CoreDNS is a DNS server written in Go. Prior to 1.14.7, the DNS-over-HTTPS, DNS-over-HTTP/3, DNS-over-QUIC, and DNS-over-gRPC listeners in plugin/pkg/doh/doh.go, core/dnsserver/server_quic.go, and core/dnsserver/server_grpc.go call dns.Msg.Unpack without the dns.DefaultMsgAcceptFunc request policy used by UDP, TCP, and DNS-over-TLS. An unauthenticated client can send an RFC 2136 UPDATE that the proxy or forward plugin passes unchanged to an update-capable upstream. If that upstream trusts CoreDNS\u0027s source address or connection and does not require an attacker-unknown end-to-end TSIG, the request appears to originate from CoreDNS and can add, replace, or delete DNS records, redirect traffic, take over names, alter mail routing, or disrupt the writable zone. This issue is fixed in version 1.14.7.","datePublished":"Sep 16, 2026, 6:39:22 PM","dateUpdated":"Sep 17, 2026, 7:25:42 PM","status":"PUBLISHED","baseScore":7.5,"baseScoreVersion":"3.1","baseScoreVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","references":"https://github.com/coredns/coredns/security/advisories/GHSA-9gm5-9rfh-m6vx\nhttps://github.com/coredns/coredns/commit/530b0a5ff2ad68cc0421f10dd93568945cc671c9\nhttps://github.com/coredns/coredns/releases/tag/v1.14.7\n","enisa_id":"EUVD-2026-80989\n","assigner":"GitHub_M","epss":0.44,"dataProcessed":"Oct 28, 2026, 7:13:23 AM","vulnerabilityProduct":[{"id":"95ee08b0-a4ce-3dc4-b2a0-bf44c3e8b0fd","product":{"name":"coredns","vendor":{"name":"coredns"}},"product_version":"\u003c 1.14.7"}],"vulnerabilityVendor":[{"id":"d7a6da25-3c67-3da1-a46c-c84781e35ffd","vendor":{"name":"coredns"}}]}},{"id":"c640bd73-7ade-3b7b-9b67-dcfdcd6edd0f","vulnerability":{"id":"GHSA-9gm5-9rfh-m6vx","description":"CoreDNS DoH/DoQ/gRPC bypass UPDATE rejection enforced on UDP/TCP","datePublished":"Sep 17, 2026, 8:33:05 PM","dateUpdated":"Sep 17, 2026, 8:33:06 PM","baseScore":0.0,"references":"https://github.com/coredns/coredns/security/advisories/GHSA-9gm5-9rfh-m6vx\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-86003\nhttps://github.com/coredns/coredns/commit/530b0a5ff2ad68cc0421f10dd93568945cc671c9\nhttps://github.com/coredns/coredns\nhttps://github.com/coredns/coredns/releases/tag/v1.14.7\n","enisa_id":"EUVD-2026-80989\n","aliases":"CVE-2026-86003\nGHSA-9gm5-9rfh-m6vx\n","epss":0.0,"dataProcessed":"Oct 25, 2026, 2:01:46 AM","vulnerabilityProduct":[],"vulnerabilityVendor":[]}}],"enisaIdAdvisory":[{"id":"1631a1e5-9324-3250-8843-a6dd831bdc2c","advisory":{"id":"msrc_CVE-2026-86003","description":"CoreDNS DoH/DoQ/gRPC bypass UPDATE rejection enforced on UDP/TCP","datePublished":"Sep 18, 2026, 1:01:29 AM","dateUpdated":"Oct 7, 2026, 1:46:51 AM","baseScore":0.0,"references":"https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-86003.json\n","aliases":"CVE-2026-86003\n","source":{"id":20,"name":"csaf_microsoft"},"advisoryProduct":[{"id":"3eb7535e-1a78-3d52-823c-0d5268a9ae73","product":{"name":"Azure Linux","vendor":{"name":"Microsoft"}}},{"id":"8459a8b6-13b2-3695-8f07-662d89ed5431","product":{"name":"azl3 coredns 0:1.11.4-21.azl3","vendor":{"name":"Microsoft"}}},{"id":"eb9f6d63-9cdc-3e3a-9d41-641b300e3233","product":{"name":"coredns","vendor":{"name":"coredns"}}},{"id":"fe6b8262-4333-36f0-bab9-74e414d2d067","product":{"name":"3.0","vendor":{"name":"Wind River"}}}]}}]}