Vulnerability record · CVE-2026-62309 · published 16 July 2026

CVE-2026-62309: Coredns.io coredns null pointer dereference vulnerability

CCoredns.Io · Coredns

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.

7.5 CVSS 3.1 High EPSS 0.66% · top 50.3% CWE-476 · NULL pointer dereference

7.5CVSS 3.1 base score

0.66%EPSS exploitation probability, 30 days

NoNot in CISA KEV

1Affected product versions listed by NVD

4References, 1 tagged exploit

22 Jul 2026Last modified by NVD

Description

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

CCoredns Coredns.Io

References

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

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-62309), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.