Malicious Code Injection in mere_cheetah_z3n Package - npm Vulnerability
Summary
MAL-2025-88419: Malicious code in mere_cheetah_z3n (npm). Affected versions are not published. No fix is published. How to fix ↓
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Background
The mere_cheetah_z3n package is part of the npm ecosystem, which is widely used for JavaScript development. This package has been identified as part of a malicious campaign that aims to exploit the npm registry by flooding it with derivative packages. The malicious code within this package is designed to manipulate package metadata and inflate developer reputation scores through automated publishing scripts.
Vulnerability Detail
The vulnerability originates from the mere_cheetah_z3n package, which is associated with the tea.xyz token reward campaign. This package contains scripts that automatically generate and publish derivative packages with randomized names, effectively polluting the npm registry. The malicious payload modifies the package.json file by removing private flags, altering version numbers, and continuously republishing variants, which can lead to significant reputational damage for developers and compromise the integrity of the npm ecosystem.
How To Fix
This package is malicious. Remove it and rotate any credentials it could have accessed.
npm uninstall mere_cheetah_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 prevent the installation of the mere_cheetah_z3n package by using npm's package-lock.json file to lock your dependencies. Additionally, you can monitor your project for vulnerabilities using tools like Vulert, which analyzes your package-lock.json to alert you in real-time for any open-source vulnerabilities.
Conclusion
The mere_cheetah_z3n package poses a significant risk due to its malicious code that manipulates package metadata and floods the npm registry. It is crucial for developers to remove this package and monitor their projects for vulnerabilities to maintain the integrity of their applications.
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FAQ
The mere_cheetah_z3n package is an npm package that has been identified as part of a malicious campaign to exploit the npm registry.
This vulnerability can compromise the integrity of your project by introducing malicious code that modifies package metadata and floods the npm registry with unwanted packages.
You should uninstall the mere_cheetah_z3n package immediately and check for any dependencies that may be affected.
Yes, you can use Vulert to monitor your project for vulnerabilities by analyzing your package-lock.json file without requiring any code access or installation.
Regularly audit your dependencies, use tools like Vulert for real-time monitoring, and avoid installing packages from untrusted sources.
