Malicious Code Vulnerability in catwrestlinghuman Package
Summary
MAL-2026-16328: Malicious code in catwrestlinghuman (npm). Affects catwrestlinghuman versions 1.0.0. No fix is published. How to fix ↓
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Background
The catwrestlinghuman package is an npm package that lacks a clear description, author, and dependencies. It is designed to execute JavaScript code upon installation. This package is particularly concerning due to its use of obfuscation techniques, specifically JSFuck, which makes the code difficult to read and analyze, raising significant security risks.
Vulnerability Detail
The vulnerability originates from the package's postinstall hook, which triggers the execution of a large, obfuscated JavaScript file (index.js) composed entirely of JSFuck characters. This file decodes and executes arbitrary JavaScript code at runtime, posing a severe risk to the installer's machine. The presence of another similarly encoded file (extension.js) suggests a multi-stage payload, further complicating detection and mitigation efforts. The lack of readable source code and the use of obfuscation techniques indicate that the package contains malicious code.
How To Fix
This package is malicious. Remove it and rotate any credentials it could have accessed.
npm uninstall catwrestlinghumanIf it arrived as a transitive dependency, remove the package that pulled it in, then reinstall.
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Workaround
As a workaround, avoid installing the catwrestlinghuman package altogether. If it is already installed, ensure to remove it immediately and monitor your project for any unusual behavior or unauthorized code execution.
Conclusion
The catwrestlinghuman package poses a significant security risk due to its malicious code execution upon installation. Users are advised to uninstall the package immediately and utilize tools like Vulert for ongoing monitoring of their projects to prevent future vulnerabilities.
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FAQ
The catwrestlinghuman package is an npm package that executes JavaScript code upon installation, but it lacks proper documentation and is known to contain malicious code.
The vulnerability manifests through a postinstall hook that executes obfuscated JavaScript code, which can lead to arbitrary code execution on the installer's machine.
If you have installed the catwrestlinghuman package, you should uninstall it immediately using the command npm uninstall catwrestlinghuman.
You can use Vulert, which monitors and alerts in real-time for open-source vulnerabilities by analyzing your package-lock.json file. You can also check for vulnerabilities using the Vulert playground without signing up.
To prevent similar vulnerabilities, always review package dependencies, avoid installing packages without proper documentation, and utilize tools like Vulert for real-time vulnerability monitoring.
References
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