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CVE-2026-62994

CVE-2026-62994 · CoreDNS `k8s_external` headless AXFR can emit an empty transfer batch that panics the `transfer` plugin

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 3.7 · Low · EPSS 0.5%

Published
Updated

Stack: network

Affected products and versions

  • coredns

    Versions
    • >= 1.9.4, < 1.14.5: Affected

    No fix published

Original sources

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