Riskcovery

CVE-2026-62994

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

State
Published
Severity
3.7 Low
Published
Jul 16, 2026
Updated
Jul 17, 2026
Reserved
Jul 14, 2026

Read the record on cve.org

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.

Scores

CVSSScoreVectorSource
3.13.7 LowCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:LGitHub_M

Weaknesses

  • CWE-248 Uncaught Exception
  • CWE-755 Improper Handling of Exceptional Conditions

Affected Products

ProductVersions
corednscoredns
  • >= 1.9.4, < 1.14.5Affected

References

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