Malicious Code Injection in ill_mouse_z3n Package - npm Vulnerability
Summary
MAL-2025-94919: Malicious code in ill_mouse_z3n (npm). Affected versions are not published. No fix is published. How to fix ↓
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Background
The ill_mouse_z3n package is part of the npm ecosystem, which is widely used for JavaScript package management. This package, like many others, is intended to facilitate the development and deployment of applications by providing reusable code. However, it has been identified as part of a malicious campaign that aims to manipulate the npm registry and inflate developer reputation scores through the creation of derivative packages.
Vulnerability Detail
The vulnerability in the ill_mouse_z3n package originates from its association with a token reward campaign that floods the npm registry with malicious packages. These packages contain scripts designed to automatically modify the package.json file, removing private flags, altering version numbers, and generating random package names. This behavior not only pollutes the npm registry but also poses a risk to developers who may unknowingly install these malicious packages, potentially leading to security breaches and compromised applications.
How To Fix
This package is malicious. Remove it and rotate any credentials it could have accessed.
npm uninstall ill_mouse_z3nIf it arrived as a transitive dependency, remove the package that pulled it in, then reinstall.
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Workaround
As a temporary workaround, you can avoid using the ill_mouse_z3n package and any other packages that may be part of the malicious campaign. Regularly audit your npm packages using tools like npm audit to identify and address vulnerabilities in your dependencies.
Conclusion
The ill_mouse_z3n package poses a significant security risk due to its malicious code designed to manipulate the npm registry. It is crucial for developers to remove this package from their projects and to regularly audit their dependencies to maintain application security.
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FAQ
The ill_mouse_z3n package is an npm package that has been identified as part of a malicious campaign to manipulate the npm registry.
This vulnerability can lead to the installation of malicious code, which may compromise your application's security and integrity.
You should uninstall the ill_mouse_z3n package immediately using the command npm uninstall ill_mouse_z3n.
You can use tools like Vulert, which monitors your package-lock.json file for open-source vulnerabilities in real-time. You can also check your application against known vulnerabilities using the Vulert playground without any signup.
Yes, tools like npm audit and Vulert can help identify and alert you to vulnerabilities in your npm packages.
