Malicious Code Injection in smart_barnacle_z3n Package

smart_barnacle_z3n Updated 27 Nov 2025

Summary

11/11/2025
CRITICAL
No i
Critical
Not published

MAL-2025-90697: Malicious code in smart_barnacle_z3n (npm). Affected versions are not published. No fix is published. How to fix ↓

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Background

The smart_barnacle_z3n package is part of the npm ecosystem, often utilized in JavaScript applications for various functionalities. However, it has been identified as part of a malicious campaign that floods the npm registry with derivative packages aimed at inflating developer reputation scores for token rewards. This package is particularly vulnerable due to its design, which allows for the automatic generation and publication of harmful variants.

Vulnerability Detail

The vulnerability originates from the malicious intent behind the smart_barnacle_z3n package, which 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 harmful variants, polluting the npm registry and potentially compromising the integrity of applications that depend on this package. The malicious payload can affect the reputation of developers and lead to security risks in applications using these packages.

How To Fix

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

npm uninstall smart_barnacle_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 remove the smart_barnacle_z3n package from your project by executing: npm uninstall smart_barnacle_z3n. This will prevent any malicious code from executing until a safe version is available.

Conclusion

The smart_barnacle_z3n package poses a significant risk due to its malicious code that modifies package configurations and repopulates harmful variants. It is crucial to take immediate action by updating or removing the package and utilizing tools like Vulert for ongoing vulnerability monitoring.

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FAQ

The smart_barnacle_z3n package is an npm package that has been identified as part of a malicious campaign to inflate developer reputation scores.

The vulnerability can lead to the automatic generation of harmful package variants, potentially compromising your application's integrity and security.

You should uninstall the smart_barnacle_z3n package immediately and monitor for any updates or patches that may be released.

Yes, you can use Vulert, which monitors and alerts for open-source vulnerabilities in real-time using just your package-lock.json file.

You can use the Vulert playground at Vulert Scanner to check if your application is affected by this vulnerability without requiring 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 smart_barnacle_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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