What is CVE-2026-62309?

CVE-2026-62309 is a high-severity vulnerability in Coredns, classified under NULL Pointer Dereference. CVSS score: 7.5/10. Published 2026-07-16.

How severe is CVE-2026-62309?

High severity. CVSS v3 base score is 7.5 out of 10.

NULL pointer dereference in Coredns

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 he…

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Coredns — versions < 1.14.4

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

References

security-advisories@github.com (x_refsource_MISC)
security-advisories@github.com (x_refsource_MISC)
security-advisories@github.com (x_refsource_MISC)
security-advisories@github.com (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-62309?: CVE-2026-62309 is a high-severity vulnerability in Coredns, classified under NULL Pointer Dereference. CVSS score: 7.5/10. Published 2026-07-16.
How severe is CVE-2026-62309?: High severity. CVSS v3 base score is 7.5 out of 10.