{"api_version":"1","generated_at":"2026-07-16T22:39:18+00:00","cve":"CVE-2026-62309","urls":{"html":"https://cve.report/CVE-2026-62309","api":"https://cve.report/api/cve/CVE-2026-62309.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-62309","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-62309"},"summary":{"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. 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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."}],"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","description":"CWE-476: NULL Pointer Dereference","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2026-07-16T19:42:17.867Z","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M"},"references":[{"name":"https://github.com/coredns/coredns/security/advisories/GHSA-9rvv-m5g5-wc8r","tags":["x_refsource_CONFIRM"],"url":"https://github.com/coredns/coredns/security/advisories/GHSA-9rvv-m5g5-wc8r"},{"name":"https://github.com/coredns/coredns/pull/8154","tags":["x_refsource_MISC"],"url":"https://github.com/coredns/coredns/pull/8154"},{"name":"https://github.com/coredns/coredns/commit/60a439dd4febfcd78e3779e952fe3fbf3c16bb1f","tags":["x_refsource_MISC"],"url":"https://github.com/coredns/coredns/commit/60a439dd4febfcd78e3779e952fe3fbf3c16bb1f"},{"name":"https://github.com/coredns/coredns/releases/tag/v1.14.4","tags":["x_refsource_MISC"],"url":"https://github.com/coredns/coredns/releases/tag/v1.14.4"}],"source":{"advisory":"GHSA-9rvv-m5g5-wc8r","discovery":"UNKNOWN"},"title":"CoreDNS: proxyproto plugin panics on PPv2 datagram with non-UDP transport — single 28-byte packet remote DoS"}},"cveMetadata":{"assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","assignerShortName":"GitHub_M","cveId":"CVE-2026-62309","datePublished":"2026-07-16T19:42:17.867Z","dateReserved":"2026-07-13T19:27:58.314Z","dateUpdated":"2026-07-16T19:42:17.867Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-07-16 20:16:47","lastModifiedDate":"2026-07-16 20:16:47","problem_types":["CWE-476","CWE-476 CWE-476: NULL Pointer Dereference"],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":7.5,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":3.9,"impactScore":3.6}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"62309","Ordinal":"1","Title":"CoreDNS: proxyproto plugin panics on PPv2 datagram with non-UDP ","CVE":"CVE-2026-62309","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"62309","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"CoreDNS: proxyproto plugin panics on PPv2 datagram with non-UDP "}]}}}