Malicious Code Injection in tough_wombat_z3n: A Threat to npm Ecosystem

tough_wombat_z3n Updated 27 Nov 2025

Summary

11/11/2025
CRITICAL
No i
Critical
Not published

MAL-2025-97040: Malicious code in tough_wombat_z3n (npm). Affected versions are not published. No fix is published. How to fix ↓

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Background

The package tough_wombat_z3n is part of the npm ecosystem, which is widely used for JavaScript package management. It is often utilized by developers to manage dependencies in their projects. However, this package has been identified as part of a malicious campaign that aims to inflate developer reputation scores through the creation of numerous derivative packages. This behavior not only compromises the integrity of the npm registry but also poses significant risks to developers who unknowingly incorporate such packages into their projects.

Vulnerability Detail

The vulnerability in tough_wombat_z3n stems from its involvement in a malicious campaign that modifies package.json files to remove private flags, alters version numbers, and generates random package names. This results in the continuous republishing of variants that can pollute the npm registry. The malicious payload can lead to unintended consequences for developers, including the potential exposure of sensitive data and the introduction of security risks into their applications.

How To Fix

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

npm uninstall tough_wombat_z3n

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 →

Workaround

As a temporary measure, you can avoid using the tough_wombat_z3n package and instead look for alternative packages that provide similar functionality without the associated risks. Always verify the integrity and source of packages before including them in your projects.

Conclusion

The tough_wombat_z3n package poses a significant threat to the npm ecosystem due to its malicious behavior. Developers are urged to remove this package from their projects and remain vigilant about the packages they use. Regular monitoring and updating of dependencies are crucial to maintaining application security.

See every vulnerability recorded for tough_wombat_z3n →

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FAQ

tough_wombat_z3n is an npm package that has been identified as part of a malicious campaign aimed at inflating developer reputation scores.

The vulnerability can lead to the introduction of malicious code into your project, potentially compromising sensitive data and application security.

You should uninstall the package immediately using the command 'npm uninstall tough_wombat_z3n' and review your project's dependencies for any other potentially malicious packages.

You can use tools like Vulert, which monitors your package-lock.json for open-source vulnerabilities in real-time. You can check your application for vulnerabilities using the Vulert playground without any signup.

Yes, you should look for reputable packages that offer similar functionality and have a good track record in the npm community.

How To Fix

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

npm uninstall tough_wombat_z3n

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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