CVE-2026-62309
High
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.
SeverityHigh
CVSS7.5
Exploit probability—
ProductCoredns
PublishedJul 16, 2026
First seenJul 16, 2026
Weakness typeCWE-476NULL pointer dereference
How to fix
Update
- coredns.io coredns1.14.4 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| coredns.io coredns | v < 1.14.4 | 1.14.4 |
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