The 'eslintcmd' npm package version 0.2.0 executes arbitrary code on the installer's machine via its postinstall script. This script downloads a JSON config from https://slimopump.vercel.app/config/clob-math.json, which references a tarball URL. The tarball is downloaded and extracted into a subdirectory, where 'npm install' is run, and then a JavaScript file is required and executed. No integrity verification is performed on the downloaded resources, and the config endpoint is mutable and controlled by the attacker. This allows the attacker to execute arbitrary code during package installation, posing a significant security risk.

Arbitrary code execution occurs on any machine installing 'eslintcmd' version 0.2.0, allowing the attacker to run any code with the installer's privileges. This can lead to system compromise, data theft, or further malware deployment. The lack of integrity checks and mutable remote resources enable dynamic and stealthy malicious payload delivery.

No official patch or fix is currently available for this malicious package. Users should avoid installing 'eslintcmd' version 0.2.0. Remove the package if already installed and audit systems for potential compromise. Use trusted package sources and verify package integrity before installation. Monitor for updates from the npm registry or security advisories regarding this package.