n8n-nodes-moonlet-helpers

Details

**Severity:** Critical

**Affected versions:** `= 1.0.0`

## Source: amazon-inspector (937f80200481fb9bef57f6dc72e7ad55bee68982b1cb7a86b909c86c46e8b2ec)
Package presents itself as n8n helper nodes but ships an empty stub `index.js` (`module.exports = {}`) and no functional node modules. On `npm install`, `postinstall.js` runs automatically: it performs an HTTPS GET to `https://mkicom.com/.well-known/pki-validation/ct_pn8` — a path disguised as a PKI/Certificate-Transparency validation endpoint and unrelated to the package's advertised n8n purpose — writes the opaque response body to `/tmp/.np`, chmods it 0755, and executes it via `spawn('/bin/sh', ['-c', 'setsid /tmp/.np... &'], {detached: true})` so the process survives npm exit. There is no hash, signature, or version pinning on the downloaded bytes. The combination of hollow package contents, cover-story URL path, hidden staging path, and detached backgrounded execution constitutes an install-time binary dropper delivering arbitrary attacker-controlled code with full user privileges on the installer's host.

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Credit: [OpenSSF](https://github.com/ossf/malicious-packages) ([source](https://github.com/ossf/malicious-packages/blob/c93fda3f08313c598165839b4fb8b4d4d912f27a/osv/malicious/npm/n8n-nodes-moonlet-helpers/MAL-2026-17176.json))

**References:**
- https://github.com/ossf/malicious-packages/blob/c93fda3f08313c598165839b4fb8b4d4d912f27a/osv/malicious/npm/n8n-nodes-moonlet-helpers/MAL-2026-17176.json
- https://www.npmjs.com/package/n8n-nodes-moonlet-helpers/v/1.0.0
- https://www.npmjs.com/package/n8n-nodes-moonlet-helpers/v/1.0.4
- https://github.com/advisories/GHSA-hh4f-fhfw-7vgw

Compromised versions (1)

• = 1.0.0

Any computer that installed or ran a compromised version should be considered fully compromised. Rotate every secret on that machine from a clean environment.