Malicious Code Injection in mans-matdu-masan: A Threat to npm Ecosystem

mans-matdu-masan Updated 26 Nov 2025

Summary

12/11/2025
CRITICAL
No i
Critical
Not published

MAL-2025-159711: Malicious code in mans-matdu-masan (npm). Affected versions are not published. No fix is published. How to fix ↓

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Background

The package 'mans-matdu-masan' is part of the npm ecosystem, which is widely used for JavaScript package management. This package has been identified as part of a malicious campaign that aims to exploit the npm registry by flooding it with derivative packages. These packages are designed to inflate developer reputation scores through automated publishing scripts, which can lead to significant pollution of the npm registry.

Vulnerability Detail

The vulnerability in 'mans-matdu-masan' stems from its involvement in the tea.xyz token reward campaign. The package contains scripts that modify the package.json file to remove private flags, alter version numbers, and generate random package names. This behavior not only compromises the integrity of the npm registry but also poses risks to developers who may unknowingly use these malicious packages, leading to potential security breaches in their applications.

How To Fix

This package is malicious. Remove it and rotate any credentials it could have accessed.

npm uninstall mans-matdu-masan

If 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 'mans-matdu-masan' package and monitor your project for any dependencies that may indirectly include it. Use the following command to check for outdated packages: 'npm outdated'.

Conclusion

The 'mans-matdu-masan' package poses a significant threat to the npm ecosystem due to its malicious behavior. It is crucial for developers to be aware of such vulnerabilities and take immediate action to protect their applications. Regular monitoring and updates are essential to maintain security in software development.

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FAQ

It is an npm package that has been identified as part of a malicious campaign to exploit the npm registry.

Using this package can lead to security risks, including the potential for malicious code execution and pollution of the npm registry.

You should uninstall the package immediately using 'npm uninstall mans-matdu-masan' and check your project for any related vulnerabilities.

You can use tools like Vulert, which monitors your package-lock.json for open-source vulnerabilities in real-time without requiring code access.

Yes, you can use the Vulert playground at Vulert Scanner to check if your application is affected by this vulnerability without any signup.

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How To Fix

This package is malicious. Remove it and rotate any credentials it could have accessed.

npm uninstall mans-matdu-masan

If it arrived as a transitive dependency, remove the package that pulled it in, then reinstall.

Tip — Not sure whether your app is affected? Vulert can check the versions your app actually runs. Scan free →

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