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[ CVE-2026-62994 · Published 16 Jul 2026 ]

CoreDNS `k8s_external` headless AXFR can emit an empty transfer batch that panics the `transfer` plugin

CVSS 3.7 EPSS <1%Fix available

[ Why it matters ]Priority signals

  • Public proof-of-concept exploit exists (CISA SSVC)

[ Description ]Official description

CoreDNS is a DNS server written in Go. From 1.9.4 until 1.14.5, a network DNS client allowed to request AXFR for a CoreDNS zone can trigger a panic when CoreDNS is configured with k8s_external headless-service zone transfers and Kubernetes contains a headless service endpoint with no declared ports; plugin/kubernetes/object/endpoint.go creates Port: -1, plugin/k8s_external/msg_to_dns.go skips that service, plugin/k8s_external/transfer.go sends an empty []dns.RR batch, and plugin/transfer/transfer.go indexes records[0] without checking the batch is non-empty. This issue is fixed in version 1.14.5.

[ Fixes ]Fixes and patches

  • github.com/coredns/coredns 1.14.5Fixed version · GitHub Advisories · go package github.com/coredns/coredns: upgrade to 1.14.5 or later (affected >= 1.9.4, <= 1.14.4)

[ Packages ]Affected open-source packages

  • github.com/coredns/coredns goAffected >= 1.9.4, <= 1.14.4 · fixed in 1.14.5 · GHSA-74w3-63xv-x9mv

[ References ]References