Malicious Code Injection in expensive_roadrunner_z3n Package

expensive_roadrunner_z3n Updated 27 Nov 2025

Summary

11/11/2025
CRITICAL
No i
Critical
Not published

MAL-2025-98709: Malicious code in expensive_roadrunner_z3n (npm). Affected versions are not published. No fix is published. How to fix ↓

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Background

The expensive_roadrunner_z3n package is part of the npm ecosystem, often utilized in JavaScript projects for various functionalities. However, it has been identified as part of a malicious campaign that floods the npm registry with derivative packages. This package is designed to inflate developer reputation scores through automated scripts that publish numerous variants of itself, which can lead to significant pollution of the npm registry.

Vulnerability Detail

The vulnerability originates from the package being part of a malicious campaign associated with the tea.xyz token reward system. It 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 package but also poses risks to developers who may unknowingly use these polluted packages, leading to potential security breaches and loss of trust in the npm ecosystem.

How To Fix

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

npm uninstall expensive_roadrunner_z3n

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 expensive_roadrunner_z3n package altogether and look for alternative packages that provide similar functionality without the associated risks.

Conclusion

The expensive_roadrunner_z3n package poses a significant risk due to its malicious code designed to manipulate the npm registry. Developers are advised to remove this package and monitor their projects for similar vulnerabilities using tools like Vulert to maintain the integrity and security of their applications.

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FAQ

The malicious code modifies package.json files and publishes numerous variants to inflate developer reputation scores.

You can use Vulert, which monitors and alerts for open-source vulnerabilities in your software. Check your application using the Vulert playground at Vulert Scanner.

Immediately remove the expensive_roadrunner_z3n package from your project and check for any dependencies that may also be affected.

Using this package can lead to security breaches, as it may introduce vulnerabilities and compromise the integrity of your application.

Regularly audit your dependencies, use tools like Vulert for monitoring, and stay updated on security advisories related to the packages you use.

Sponsored Lume, the Habilume companion Habilume Habit tracker with a companion that grows with you Complete habits, earn Lume Points, and watch your Lume grow as you stay consistent. App Store Google Play

How To Fix

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

npm uninstall expensive_roadrunner_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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