High 7.5Published Jul 16, 2026

CVE-2026-62309CoreDNS: proxyproto plugin panics on PPv2 datagram with non-UDP transport — single 28-byte packet remote DoS

Updated under an hour ago (Oct 27, 2026, 2:30 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-476
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Jul 17, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

coredns coredns coredns:coredns (from the name)	before 1.14.4	CNA record
coredns.io coredns coredns.io:coredns	before 1.14.4	NVD

References

References

https://github.com/coredns/coredns/security/advisories/GHSA-9rvv-m5g5-wc8r	x-refsource-confirm, exploit, third-party-advisory
https://github.com/coredns/coredns/pull/8154	x-refsource-misc, issue-tracking, patch
https://github.com/coredns/coredns/commit/60a439dd4febfcd78e3779e952fe3fbf3c16bb1f	x-refsource-misc, patch
https://github.com/coredns/coredns/releases/tag/v1.14.4	x-refsource-misc, release-notes

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.