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 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 v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/coredns/coredns/commit/60a439dd4febfcd78e3779e952fe3fbf3c16bb1f	Patch
https://github.com/coredns/coredns/pull/8154	Issue Tracking Patch
https://github.com/coredns/coredns/releases/tag/v1.14.4	Release Notes
https://github.com/coredns/coredns/security/advisories/GHSA-9rvv-m5g5-wc8r	Exploit Third Party Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:coredns.io:coredns:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-07-16 20:16

Updated : 2026-07-22 20:17

NVD link : CVE-2026-62309

Mitre link : CVE-2026-62309

CVE.ORG link : CVE-2026-62309

JSON object : View

Products Affected

coredns.io

coredns

CWE

CWE-476

NULL Pointer Dereference

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