CVE-2026-62309 — Security Box Score

CVE · referencelatest edition

Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-62309HIGH

CoreDNS: proxyproto plugin panics on PPv2 datagram with non-UDP transport — single 28-byte packet remote DoS

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   N  U  N  N  H    7.5   .0038   31.0     —

AFFECTED
  Product  Versions    Fixed
  coredns  < 1.14.4 –  —

TIMELINE
  Jul 13  Reserved by GitHub_M
  Jul 16  EXPLOIT PUBLISHED — CVE-2026-62309 (coredns). Public exploit reference added.
  Jul 16  Published (CNA: GitHub_M)

CWE-476 · CNA: GitHub_M · CVSS v3.1 · 4 references · NVD status: Analyzed

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
July 13, 2026	Reserved	Reserved by GitHub_M
July 16, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-62309 (coredns). Public exploit reference added.
July 16, 2026	Published	Published (CNA: GitHub_M)

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
coredns	coredns	—	< 1.14.4	—

Weaknesses

CWE-476

References (4)

https://github.com/coredns/coredns/commit/60a439dd4febfcd78e3779e952fe3fbf3c16bb1f [Patch]
https://github.com/coredns/coredns/pull/8154 [Issue Tracking, Patch]
https://github.com/coredns/coredns/releases/tag/v1.14.4 [Release Notes]
https://github.com/coredns/coredns/security/advisories/GHSA-9rvv-m5g5-wc8r [Exploit, Third Party Advisory]

Authoritative record: CVE-2026-62309 at cve.org

Vendors: coredns

Weaknesses: CWE-476

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-62309 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.