Supply Chain Attack Scanner for Vibe Coding: NPM Dependencies Guide

Quick answer

A supply chain attack in vibe-coded apps occurs when malicious code is introduced through npm dependencies — often via typosquatting, dependency confusion, or compromised packages. To scan for these risks, use a combination of automated security tools like OverMCP's free AI app security scanner, npm audit, and manual checks on suspicious packages, focusing on your package.json and lockfile.

What to check first

Before deep-diving, run this quick checklist on any vibe-coded app (especially those built with Cursor, Bolt.new, v0, or Lovable):

Step-by-step fix

Here's a practical workflow to scan and fix supply chain risks in your vibe-coded app:

1. Initial scan with npm audit

npm audit --json | jq '.vulnerabilities'

This outputs a JSON list of known vulnerabilities. Focus on critical and high severity. For each, run:

npm audit fix --force

But be cautious: --force may introduce breaking changes. Prefer manual updates by checking each package's changelog.

2. Detect malicious packages with specialized tools

Use OverMCP's secret leak scanner to find leaked tokens that could be used to publish malicious packages under your name. Also, run a tool like npm-malware-scanner:

npx risk-scanner

This scans for known malicious packages and suspicious behaviors like network requests in install scripts.

3. Check for dependency confusion

Dependency confusion happens when your app uses a private package name that also exists on the public npm registry. To prevent this, always scope your private packages (e.g., @mycompany/package). If you use a mix of public and private, run:

npm ls --depth=0 | grep -E '^[^@]' | while read pkg; do
  npm view "$pkg" name 2>/dev/null || echo "$pkg not found on public registry"
done

4. Lock down your dependencies

Add a .npmrc file to your project with:

# Prevent installation of packages with missing lockfile
audit-level=high
# Optional: only allow packages from specific registry
registry=https://registry.npmjs.org/

Also, use --ignore-scripts when installing dependencies in production to block malicious postinstall scripts:

npm install --ignore-scripts --production

5. Continuous monitoring

Integrate a continuous security monitoring tool that alerts you when a new vulnerability is discovered in your dependencies. For CI/CD, add a step that fails the build if npm audit finds high-severity issues:

# .github/workflows/security.yml
name: Dependency Scan
on: [push, pull_request]
jobs:
  audit:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: actions/setup-node@v4
      - run: npm audit --audit-level=high

Common mistakes

Vibe-coded apps often make these supply chain mistakes:

FAQ

What is a supply chain attack in npm?

A supply chain attack on npm is when an attacker compromises a legitimate package or creates a malicious one that gets installed into your application, giving them access to your code, data, or infrastructure.

How do I know if my vibe-coded app has been compromised?

Signs include unexpected network requests, excessive CPU usage, new files appearing in node_modules, or your app behaving strangely. Run npm audit and use a free AI app security scanner to detect known issues.

Can AI coding tools introduce supply chain risks?

Yes. AI tools often suggest packages from npm, and they can't always verify the package's integrity or distinguish between legitimate and malicious packages. Always audit AI-recommended dependencies manually.