{"id":"CVE-2026-62309","title":"CoreDNS is a DNS server written in Go","summary":"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 …","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-476"],"published":"2026-07-16","updated":"2026-07-18","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-62309","references":[{"url":"https://github.com/coredns/coredns/commit/60a439dd4febfcd78e3779e952fe3fbf3c16bb1f","label":"security-advisories@github.com"},{"url":"https://github.com/coredns/coredns/pull/8154","label":"security-advisories@github.com"},{"url":"https://github.com/coredns/coredns/releases/tag/v1.14.4","label":"security-advisories@github.com"},{"url":"https://github.com/coredns/coredns/security/advisories/GHSA-9rvv-m5g5-wc8r","label":"security-advisories@github.com"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-62309.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-62309"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2501535"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-62309"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-62309"},{"url":"https://access.redhat.com/errata/RHSA-2026:63016"}],"tags":["nvd","csaf","vex","red-hat"],"epss":0.00662,"epssPercentile":0.51468,"ingestedAt":"2026-07-18T20:24:54.544Z","vendor":"Red Hat","product":"Red Hat Advanced Cluster Management for Kubernetes 2.17","affected":["connectivity_link 1","openshift_container_platform 4","advanced_cluster_management_for_kubernetes 2.17"],"patched":["advanced_cluster_management_for_kubernetes 2.17"],"slug":"CVE-2026-62309","body":"## Overview\n\nCoreDNS 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **RHSA-2026:63016** · Red Hat · fixed in: Red Hat Advanced Cluster Management for Kubernetes 2.17 · released 2026-09-03 · [advisory](https://access.redhat.com/errata/RHSA-2026:63016)\n- **Red Hat VEX** · Important · affected: Red Hat Connectivity Link 1, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Connectivity Link 1, Red Hat OpenShift Container Platform 4 · updated 2026-09-26 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-62309.json)","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}