MAL-2026-17176 Malicious code in n8n-nodes-moonlet-helpers (npm)

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.