CVE-2026-62994CWE-248CWE-755

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

Low · published July 16, 2026

CVSS v3.1
3.7
EPSS
0%
Percentile
38.8
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
3.7 · LOW
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
CVSS v4.0
Not supplied
EPSS
0.00459 · 38.8th percentile
Weaknesses
CWE-248 · Uncaught Exception; CWE-755 · Improper Handling of Exceptional Conditions
Published
2026-07-16T19:39Z
EPSS history
Timeline
  • 16 JUL 19:39Z
    CoreDNS `k8s_external` headless AXFR can emit an empty transfer batch that panics the `transfer` plugin
    cvelistv5