Malicious Code Injection in rational_cattle_z3n: npm Package Vulnerability
Summary
MAL-2025-107728: Malicious code in rational_cattle_z3n (npm). Affected versions are not published. No fix is published. How to fix ↓
Check if this vulnerability affects your application
Upload a manifest or SBOM and we'll show whether you're affected, plus every other risky package in the same scan.
No signup required · Results in about 60 seconds
Background
The rational_cattle_z3n package is part of the npm ecosystem, which is widely used for JavaScript package management. This package is implicated in a token reward campaign that has led to the proliferation of malicious packages. It is designed to automate the generation and publication of derivative packages, which can compromise the integrity of the npm registry and inflate developer reputation scores.
Vulnerability Detail
The vulnerability stems from the presence of malicious code within the rational_cattle_z3n package. This code modifies the package.json file to remove private flags, alters version numbers, and generates random package names, leading to the continuous republishing of these variants. This behavior not only pollutes the npm registry but also poses a risk to developers who may unknowingly use these compromised packages, potentially leading to security breaches in their applications.
How To Fix
This package is malicious. Remove it and rotate any credentials it could have accessed.
npm uninstall rational_cattle_z3nIf 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 workaround, you can avoid using the rational_cattle_z3n package and replace it with a similar, trusted package that does not exhibit malicious behavior. Always verify the integrity of packages before installation.
Conclusion
The rational_cattle_z3n package has been identified as a source of malicious code that can compromise the integrity of npm packages. It is crucial for developers to be vigilant about the packages they use and to take immediate action to remove any compromised packages from their projects. Utilizing tools like Vulert can help in monitoring for such vulnerabilities effectively.
See every vulnerability recorded for rational_cattle_z3n →
FAQ
It is an npm package that has been identified as part of a malicious campaign to inflate developer reputation scores through the automatic generation of derivative packages.
Using the rational_cattle_z3n package can lead to security risks, including the potential for malicious code execution and the pollution of your project's dependency tree.
You should uninstall the rational_cattle_z3n package immediately and review your project's dependencies for any other potentially compromised packages.
You can use Vulert, which monitors and alerts you in real-time for open-source vulnerabilities in your software by analyzing your package-lock.json file.
Yes, you can use the Vulert playground at Vulert Scanner to check if your application is affected by this vulnerability without requiring any signup.
