low3.7
CVE-2026-62994
CoreDNS `k8s_external` headless AXFR can emit an empty transfer batch that panics the `transfer` plugin
Impact
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 packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| go | github.com/coredns/coredns | >= 1.9.4, <= 1.14.4 | 1.14.5 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Coredns.Io | Coredns | from 1.9.4 before 1.14.5 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-74w3-63xv-x9mv
- https://github.com/coredns/coredns/security/advisories/GHSA-74w3-63xv-x9mv
- https://nvd.nist.gov/vuln/detail/CVE-2026-62994
- https://github.com/coredns/coredns/pull/8207
- https://github.com/coredns/coredns/commit/ab318db7b4a3a19273852ed627f54888198c8efb
- https://github.com/coredns/coredns/releases/tag/v1.14.5