{"id":"CVE-2026-62994","state":"PUBLISHED","title":"CoreDNS `k8s_external` headless AXFR can emit an empty transfer batch that panics the `transfer` plugin","description":"CoreDNS is a DNS server written in Go. From 1.9.4 until 1.14.5, a network DNS client allowed to request AXFR for a CoreDNS zone can trigger a panic when CoreDNS is configured with k8s_external headless-service zone transfers and Kubernetes contains a headless service endpoint with no declared ports; plugin/kubernetes/object/endpoint.go creates Port: -1, plugin/k8s_external/msg_to_dns.go skips that service, plugin/k8s_external/transfer.go sends an empty []dns.RR batch, and plugin/transfer/transfer.go indexes records[0] without checking the batch is non-empty. This issue is fixed in version 1.14.5.","publishedAt":"2026-07-16T19:39:05.582Z","updatedAt":"2026-07-17T11:12:51.792Z","severity":{"score":3.7,"label":"Low","version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","source":"GitHub_M"},"assigner":"GitHub_M","products":["coredns coredns"],"affected":[{"vendor":"coredns","product":"coredns","versions":[{"version":">= 1.9.4, < 1.14.5","status":"affected"}]}],"references":["https://github.com/coredns/coredns/security/advisories/GHSA-74w3-63xv-x9mv","https://github.com/coredns/coredns/pull/8207","https://github.com/coredns/coredns/commit/ab318db7b4a3a19273852ed627f54888198c8efb","https://github.com/coredns/coredns/releases/tag/v1.14.5"],"weaknesses":["CWE-248","CWE-755"],"ingestedAt":"2026-10-29T20:12:32.778Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/62xxx/CVE-2026-62994.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-62994","state":"PUBLISHED","datePublished":"2026-07-16T19:39:05.582Z","dateUpdated":"2026-07-17T11:12:51.792Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-07-14T23:10:57.031Z"},"containers":{"cna":{"title":"CoreDNS `k8s_external` headless AXFR can emit an empty transfer batch that panics the `transfer` plugin","descriptions":[{"lang":"en","value":"CoreDNS is a DNS server written in Go. From 1.9.4 until 1.14.5, a network DNS client allowed to request AXFR for a CoreDNS zone can trigger a panic when CoreDNS is configured with k8s_external headless-service zone transfers and Kubernetes contains a headless service endpoint with no declared ports; plugin/kubernetes/object/endpoint.go creates Port: -1, plugin/k8s_external/msg_to_dns.go skips that service, plugin/k8s_external/transfer.go sends an empty []dns.RR batch, and plugin/transfer/transfer.go indexes records[0] without checking the batch is non-empty. This issue is fixed in version 1.14.5."}],"affected":[{"vendor":"coredns","product":"coredns","versions":[{"version":">= 1.9.4, < 1.14.5","status":"affected"}]}],"references":[{"url":"https://github.com/coredns/coredns/security/advisories/GHSA-74w3-63xv-x9mv","name":"https://github.com/coredns/coredns/security/advisories/GHSA-74w3-63xv-x9mv","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/coredns/coredns/pull/8207","name":"https://github.com/coredns/coredns/pull/8207","tags":["x_refsource_MISC"]},{"url":"https://github.com/coredns/coredns/commit/ab318db7b4a3a19273852ed627f54888198c8efb","name":"https://github.com/coredns/coredns/commit/ab318db7b4a3a19273852ed627f54888198c8efb","tags":["x_refsource_MISC"]},{"url":"https://github.com/coredns/coredns/releases/tag/v1.14.5","name":"https://github.com/coredns/coredns/releases/tag/v1.14.5","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":3.7,"baseSeverity":"LOW","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-248","lang":"en","description":"CWE-248: Uncaught Exception","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-755","lang":"en","description":"CWE-755: Improper Handling of Exceptional Conditions","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-07-16T19:39:05.582Z"},"source":{"advisory":"GHSA-74w3-63xv-x9mv","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/coredns/coredns/security/advisories/GHSA-74w3-63xv-x9mv","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-17T11:12:32.909197Z","id":"CVE-2026-62994","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-07-17T11:12:51.792Z"}}]}}}