OpenSSF/OSV advisory MAL-2026-13865 confirms this npm version as malicious. The package's postinstall script (duplicated as the main module) runs unconditionally on npm install. It executes `id` and `hostname`, base64-encodes the output, and transmits it as a query-string parameter to a hardcoded HTTPS endpoint at jasabersama.id/portfolio-data.php with TLS certificate validation explicitly disabled (rejectUnauthorized: false)...
Source
OpenSSF Malicious Packages via OSV
Summary
Malicious code in @years18/n8n-nodes-utils-helper-u (npm)
Details
The package's postinstall script (duplicated as the main module) runs unconditionally on npm install. It executes `id` and `hostname`, base64-encodes the output, and transmits it as a query-string parameter to a hardcoded HTTPS endpoint at jasabersama.id/portfolio-data.php with TLS certificate validation explicitly disabled (rejectUnauthorized: false). The same lifecycle hook installs the Python `impacket` package system-wide via `pip --break-system-packages` and invokes `/tmp/mhddos/start.py`, an MHDDoS attack launcher, weaponizing the installer host for outbound denial-of-service activity. The URL also carries a `c=` parameter conveying a shell command that decodes attacker-controlled bytes into `/tmp/n8n_rce_result.txt`, providing a command-staging channel back to the same remote endpoint.
Decision reason
OpenSSF Malicious Packages via OSV confirms @years18/n8n-nodes-utils-helper-u@1.0.0 as malicious (MAL-2026-13865): Malicious code in @years18/n8n-nodes-utils-helper-u (npm)