CVE-2026-62309

HighCVSS 7.5/10Last modified Jul 22, 2026

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. This issue is fixed in version 1.14.4.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-476

Affected software

Vendor	Product	Versions
coredns	coredns	< 1.14.4

References

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

Timeline

Published: Jul 16, 2026
Last modified: Jul 22, 2026
NVD status: Analyzed

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