Malicious Code Injection in fundamental_falcon_z3n: A Threat to npm Packages

fundamental_falcon_z3n Updated 27 Nov 2025

Summary

11/11/2025
CRITICAL
No i
Critical
Not published

MAL-2025-94635: Malicious code in fundamental_falcon_z3n (npm). Affected versions are not published. No fix is published. How to fix ↓

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Background

The package fundamental_falcon_z3n is part of the npm ecosystem, which is widely used for JavaScript package management. This package is associated with the tea.xyz token reward campaign, which has been known to flood the npm registry with malicious packages. These packages are designed to manipulate developer reputation scores by automatically generating and publishing derivative packages with randomized names.

Vulnerability Detail

The vulnerability in fundamental_falcon_z3n originates from its involvement in a malicious campaign that modifies the package.json file to remove private flags, alters version numbers, and generates random package names. This behavior leads to the continuous republishing of variants, polluting the npm registry and potentially compromising the integrity of other packages. The malicious payload can affect developers by inflating reputation scores fraudulently and creating confusion in package management.

How To Fix

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

npm uninstall fundamental_falcon_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 fundamental_falcon_z3n package and instead look for alternative packages that provide similar functionality without the associated risks. Always verify the integrity of packages before installation.

Conclusion

The fundamental_falcon_z3n package poses significant risks due to its malicious behavior aimed at manipulating npm registry integrity. It is crucial for developers to remove this package and utilize trusted alternatives to maintain the security of their applications.

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FAQ

fundamental_falcon_z3n is an npm package that has been identified as part of a malicious campaign aimed at manipulating developer reputation scores.

You can use Vulert, which monitors and alerts for open-source vulnerabilities in real-time. By checking your package-lock.json file, you can determine if your application is affected by this vulnerability.

Using this package can lead to the pollution of the npm registry, fraudulent reputation inflation, and potential security risks for your application.

There is no patch available for fundamental_falcon_z3n. The recommended action is to uninstall the package and avoid using it.

You can use the Vulert playground at Vulert Scanner to check if your application is affected by vulnerabilities without needing to sign up.

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How To Fix

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

npm uninstall fundamental_falcon_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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