The npm package 'squeez' versions 1.38.0, 1.40.0, 1.42.1, and 1.44.1 include a postinstall script that executes automatically during installation. This script performs reconnaissance on the user's home directory and fetches executable content from mutable URLs on raw.githubusercontent.com, which can change without a package update. The script has the capability to spawn child processes, creating a risk of executing remote, potentially malicious code at install time.