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EUVD-2026-266651

fkie_cve-2026-24470

Skipper is an HTTP router and reverse proxy for service composition. Prior to version 0.24.0, when running Skipper as an Ingress controller, users with permissions to create an Ingress and a Service of type ExternalName can create routes that enable them to use Skipper's network access to reach internal services. Version 0.24.0 disables Kubernetes ExternalName by default. As a workaround, developers can allow list targets of an ExternalName and allow list via regular expressions.

GHSA-mxxc-p822-2hx9 — Skipper Ingress Controller Allows Unauthorized Access to Internal Services via ExternalName

Affected: Go: github.com/zalando/skipper

### Impact

When running Skipper as an Ingress controller, users with permissions to create an Ingress and a Service of type ExternalName can create routes that enable them to use Skipper's network access to reach internal services.

### Patches

https://github.com/zalando/skipper/releases/tag/v0.24.0 disables Kubernetes ExternalName by default.

### Workarounds

Developers can allow list targets of an ExternalName by using `-kubernetes-only-allowed-external-names=true` and allow list via regular expressions `-kubernetes-allowed-external-name '^[a-z][a-z0-9-.]+[.].allowed.example$'`

### References

https://kubernetes.io/docs/concepts/services-networking/service/#externalname