{"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"}],"tags":["nvd"],"epss":0.00662,"epssPercentile":0.50258,"ingestedAt":"2026-07-18T20:24:54.544Z","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.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}