CVE-2026-62309

HIGH7.5

CoreDNS: proxyproto plugin panics on PPv2 datagram with non-UDP transport — single 28-byte packet remote DoS

Published Jul 16, 2026

Modified 1 months ago

Details

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.

References

WEB

https://github.com/coredns/coredns/commit/60a439dd4febfcd78e3779e952fe3fbf3c16bb1f

WEB

https://github.com/coredns/coredns/pull/8154

WEB

https://github.com/coredns/coredns/releases/tag/v1.14.4

WEB

https://github.com/coredns/coredns/security/advisories/GHSA-9rvv-m5g5-wc8r

ADVISORY

https://www.cve.org/CVERecord?id=CVE-2026-62309

CVSS Analysis