CVE-2026-62309

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.

• CWE-476

• https://github.com/coredns/coredns/commit/60a439dd4febfcd78e3779e952fe3fbf3c16bb1fPatch
• https://github.com/coredns/coredns/pull/8154Issue Tracking, Patch
• https://github.com/coredns/coredns/releases/tag/v1.14.4Release Notes
• https://github.com/coredns/coredns/security/advisories/GHSA-9rvv-m5g5-wc8rExploit, Third Party Advisory

Published

Jul 16, 2026

Last Modified

Jul 22, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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