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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| coredns | coredns | >= 1.9.4, < 1.14.5 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | coredns | 1.11.4-20 | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Go | github.com/coredns/coredns | >= 1.9.4, < 1.14.5 | 1.14.5 | GHSA-74w3-63xv-x9mv |
Advisories 1
- WID-SEC-2026-2271 CoreDNS: Mehrere Schwachstellen ermöglichen Denial of Service BSI CERT-Bund (WID) · Sep 2, 2026