{"id":"CVE-2026-62309","state":"PUBLISHED","title":"CoreDNS: proxyproto plugin panics on PPv2 datagram with non-UDP transport — single 28-byte packet remote DoS","description":"CoreDNS is a DNS server written in Go. Prior to 1.14.4, a single 28-byte UDP datagram can crash the CoreDNS process when the proxyproto plugin is enabled because plugin/pkg/proxyproto/proxyproto.go PacketConn.ReadFrom handles a PROXY v2 header with non-UDP transport such as family byte 0x11, reassigns addr from a nil readFrom result after parseProxyProtocol errors, and calls addr.String() in the warning log before ServeDNS recovery applies. This issue is fixed in version 1.14.4.","publishedAt":"2026-07-16T19:42:17.867Z","updatedAt":"2026-07-18T03:14:46.896Z","severity":{"score":7.5,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","source":"GitHub_M"},"assigner":"GitHub_M","products":["coredns coredns"],"affected":[{"vendor":"coredns","product":"coredns","versions":[{"version":"< 1.14.4","status":"affected"}]}],"references":["https://github.com/coredns/coredns/security/advisories/GHSA-9rvv-m5g5-wc8r","https://github.com/coredns/coredns/pull/8154","https://github.com/coredns/coredns/commit/60a439dd4febfcd78e3779e952fe3fbf3c16bb1f","https://github.com/coredns/coredns/releases/tag/v1.14.4"],"weaknesses":["CWE-476"],"ingestedAt":"2026-10-29T20:12:32.778Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/62xxx/CVE-2026-62309.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-62309","state":"PUBLISHED","datePublished":"2026-07-16T19:42:17.867Z","dateUpdated":"2026-07-18T03:14:46.896Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-07-13T19:27:58.314Z"},"containers":{"cna":{"title":"CoreDNS: proxyproto plugin panics on PPv2 datagram with non-UDP transport — single 28-byte packet remote DoS","descriptions":[{"lang":"en","value":"CoreDNS is a DNS server written in Go. Prior to 1.14.4, a single 28-byte UDP datagram can crash the CoreDNS process when the proxyproto plugin is enabled because plugin/pkg/proxyproto/proxyproto.go PacketConn.ReadFrom handles a PROXY v2 header with non-UDP transport such as family byte 0x11, reassigns addr from a nil readFrom result after parseProxyProtocol errors, and calls addr.String() in the warning log before ServeDNS recovery applies. This issue is fixed in version 1.14.4."}],"affected":[{"vendor":"coredns","product":"coredns","versions":[{"version":"< 1.14.4","status":"affected"}]}],"references":[{"url":"https://github.com/coredns/coredns/security/advisories/GHSA-9rvv-m5g5-wc8r","name":"https://github.com/coredns/coredns/security/advisories/GHSA-9rvv-m5g5-wc8r","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/coredns/coredns/pull/8154","name":"https://github.com/coredns/coredns/pull/8154","tags":["x_refsource_MISC"]},{"url":"https://github.com/coredns/coredns/commit/60a439dd4febfcd78e3779e952fe3fbf3c16bb1f","name":"https://github.com/coredns/coredns/commit/60a439dd4febfcd78e3779e952fe3fbf3c16bb1f","tags":["x_refsource_MISC"]},{"url":"https://github.com/coredns/coredns/releases/tag/v1.14.4","name":"https://github.com/coredns/coredns/releases/tag/v1.14.4","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-476","lang":"en","description":"CWE-476: NULL Pointer Dereference","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-07-16T19:42:17.867Z"},"source":{"advisory":"GHSA-9rvv-m5g5-wc8r","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-18T03:14:35.332561Z","id":"CVE-2026-62309","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-07-18T03:14:46.896Z"}}]}}}