Malicious Code Injection in crowded_silkworm_z3n Package
Summary
MAL-2025-93861: Malicious code in crowded_silkworm_z3n (npm). Affected versions are not published. No fix is published. How to fix ↓
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Background
The crowded_silkworm_z3n package is part of the npm ecosystem, which is widely used for JavaScript development. This package has been identified as part of a malicious campaign that floods the npm registry with derivative packages. Its primary function is to manipulate package metadata and inflate developer reputation scores through automated scripts.
Vulnerability Detail
The vulnerability in the crowded_silkworm_z3n package originates from its involvement in a token reward campaign that exploits npm's publishing system. The malicious code modifies the package.json file to remove private flags, alters version numbers, and generates random package names, leading to pollution of the npm registry. This can result in developers unknowingly using compromised packages, which may introduce security risks and instability in their applications.
How To Fix
This package is malicious. Remove it and rotate any credentials it could have accessed.
npm uninstall crowded_silkworm_z3nIf it arrived as a transitive dependency, remove the package that pulled it in, then reinstall.
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Workaround
As a temporary measure, you can avoid using the crowded_silkworm_z3n package and replace it with a known safe alternative. Always verify the integrity and source of packages before including them in your project.
Conclusion
The crowded_silkworm_z3n package poses a significant risk due to its malicious code that alters package metadata and floods the npm registry. It is crucial to remove this package from your projects and monitor your dependencies for vulnerabilities to maintain the security and integrity of your applications.
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FAQ
crowded_silkworm_z3n is an npm package that has been identified as part of a malicious campaign to inflate developer reputation scores through automated publishing.
If your application uses the crowded_silkworm_z3n package, it may be at risk of using compromised code, leading to potential security vulnerabilities and instability.
You should immediately uninstall the crowded_silkworm_z3n package using 'npm uninstall crowded_silkworm_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 file for open-source vulnerabilities in real-time. You can check your application against known vulnerabilities using the Vulert playground without any signup.
Yes, you should look for well-maintained and widely-used packages that provide similar functionality but have a good reputation and community support.
