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EUVD-2026-276766

2026-10-07T06:37:51.979750+00:00

EUVD-2026-276766

fkie_cve-2026-32769

2026-10-07T06:37:51.979781+00:00

Fullchain is an umbrella project for deploying a ready-to-use CTF platform. In versions prior to 0.1.1, due to a mis-written NetworkPolicy, a malicious actor can pivot from a subverted application to any Pod out of the origin namespace. The flawed inter-ns NetworkPolicy breaks the security-by-default property expected as part of the deployment program, leading to a potential lateral movement. This issue has been fixed in version 0.1.1. To workaround, delete the failing network policy that should be prefixed by inter-ns- in the target namespace.

GHSA-hxm7-9q36-c77f — Fullchain's Invalid NetworkPolicy enables a malicious actor to pivot into another namespace

2026-10-07T06:37:51.979814+00:00

Affected: Go: github.com/ctfer-io/fullchain

### Impact

Due to a mis-written NetworkPolicy, a malicious actor can pivot from a subverted application to any Pod out of the origin namespace. This breaks the security-by-default property expected as part of the deployment program, leading to a potential lateral movement.

### Patch

Removing the `inter-ns` NetworkPolicy patches the vulnerability. If updates are not possible in production environments, we recommend to manually delete it and update as soon as possible.

### Workaround

Given your context, delete the failing network policy that should be prefixed by `inter-ns-` in the target namespace. You can use the following to delete all matching network policy. If unsure of the outcome, please do it manually.

```bash for ns in $(kubectl get ns -o jsonpath='{.items[*].metadata.name}' | tr ' ' '\n' | grep '^ns-'); do kubectl -n "$ns" get networkpolicy -o name \ | grep '^networkpolicy.networking.k8s.io/inter-ns-' \ | xargs -r kubectl -n "$ns" delete done ```