OpenSSF/OSV advisory MAL-2026-13478 confirms this npm version as malicious. The package's preinstall lifecycle script runs on npm install and collects the installer's local username (whoami), hostname, and public IP address (fetched via ifconfig.me), then transmits them as query-string parameters in an HTTP GET request to a hardcoded subdomain of oast.fun (kwphewvexhjbtfduscqybx6q7c862eh0g.oast.fun). oast.fun is an out-of-band interaction/callback service commonly used for reconnaissance...
Source
OpenSSF Malicious Packages via OSV
Summary
Malicious code in @cats-cdf/authentication (npm)
Details
The package's preinstall lifecycle script runs on npm install and collects the installer's local username (whoami), hostname, and public IP address (fetched via ifconfig.me), then transmits them as query-string parameters in an HTTP GET request to a hardcoded subdomain of oast.fun (kwphewvexhjbtfduscqybx6q7c862eh0g.oast.fun). oast.fun is an out-of-band interaction/callback service commonly used for reconnaissance and exfiltration in dependency-confusion attacks. The behavior fires automatically on default install with no relation to any documented package purpose.
Decision reason
OpenSSF Malicious Packages via OSV confirms @cats-cdf/authentication@3.1.1 as malicious (MAL-2026-13478): Malicious code in @cats-cdf/authentication (npm)