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CVE-2026-62309

Coredns.io Coredns NULL pointer dereference

7.5 HIGHPublic exploitEPSS 0.66%
  1. Published16 Jul 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

Coredns.io Coredns< 1.14.4

Remediation

Fixed in
Coredns.io Coredns≥ 1.14.4

References

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Frequently asked

Is CVE-2026-62309 being actively exploited?

CVE-2026-62309 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.66%.

How severe is CVE-2026-62309?

CVE-2026-62309 has a CVSS 3.1 base score of 7.5, rated high. EPSS estimates a 0.66% probability of exploitation.

Which products are affected by CVE-2026-62309?

Affected products include Coredns.io Coredns.

How do I fix CVE-2026-62309?

Upgrade affected software to a fixed version, for example Coredns.io Coredns 1.14.4 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.