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 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.
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.007 (50.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 51st percentile — 50.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000
Affected products
- Coredns — versions < 1.14.4
- Coredns.io Coredns
Weakness classification (CWE)
References
- github.com/coredns/coredns/commit/60a439dd4febfcd78e3779e952fe3fbf3c16bb1f (Patch)
- github.com/coredns/coredns/pull/8154 (Patch, Issue Tracking)
- github.com/coredns/coredns/releases/tag/v1.14.4 (Release Notes)
- github.com/coredns/coredns/security/advisories/GHSA-9rvv-m5g5-wc8r (Exploit, Third Party Advisory)
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.