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High severity7.5NVD Advisory· Published Jul 16, 2026· Updated Jul 22, 2026

CVE-2026-62309

CVE-2026-62309

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.

Affected products

2
  • Coredns/Coredns2 versions
    cpe:2.3:a:coredns.io:coredns:*:*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:a:coredns.io:coredns:*:*:*:*:*:*:*:*range: <1.14.4
    • (no CPE)range: <1.14.4

Patches

Vulnerability mechanics

References

4

News mentions

0

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