Malicious Code Vulnerability in developing_marmoset_z3n Package
Summary
MAL-2025-94013: Malicious code in developing_marmoset_z3n (npm). Affected versions are not published. No fix is published. How to fix ↓
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Background
The developing_marmoset_z3n package is part of the npm ecosystem, which is widely used for JavaScript development. This package, like many others in the npm registry, is intended to facilitate various functionalities for developers. However, it has been identified as part of a malicious campaign that aims to inflate developer reputation scores through the automatic generation and publication of derivative packages. This vulnerability poses a significant risk to the integrity of the npm registry and the developers relying on these packages.
Vulnerability Detail
The vulnerability in the developing_marmoset_z3n package originates from its association with a malicious token reward campaign. The package contains scripts designed to automatically modify its own package.json file by removing private flags, altering version numbers, and generating random package names. This behavior leads to the continuous republishing of variants that pollute the npm registry, potentially compromising the security and reliability of dependent projects. The malicious payload can affect developers by introducing untrusted code into their applications.
How To Fix
This package is malicious. Remove it and rotate any credentials it could have accessed.
npm uninstall developing_marmoset_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 developing_marmoset_z3n package and replace it with a trusted alternative that provides similar functionality. Always review the dependencies of your project and ensure they are from reputable sources.
Conclusion
The developing_marmoset_z3n package has been identified as a malicious entity within the npm ecosystem, posing significant risks to developers and their projects. It is essential to remove this package from your dependencies and monitor your projects for vulnerabilities using tools like Vulert. Staying informed and proactive is key to maintaining the security of your applications.
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FAQ
The developing_marmoset_z3n package is an npm package that has been identified as part of a malicious campaign to inflate developer reputation scores.
This vulnerability can introduce untrusted code into your project, potentially compromising its security and reliability.
You should uninstall the developing_marmoset_z3n package immediately and replace it with a trusted alternative.
You can use tools like Vulert, which monitors your package-lock.json file to alert you in real-time for open-source vulnerabilities.
Yes, you can use the Vulert playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
