CVE WatchJul 16, 2026

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 plug

CVSS

7.5

High

EPSS

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KEV

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Exploit Today

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0-100

Published: Jul 16, 2026 · Last modified: Jul 16, 2026 · CWE-476

EPSS · 30d

Not enough EPSS history yet.

Technical 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.

Official references

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