Malicious Code Injection in unknown_trout_z3n Package - npm Vulnerability
Summary
MAL-2025-97160: Malicious code in unknown_trout_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 unknown_trout_z3n package 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 linked to the proliferation of malicious packages designed to inflate developer reputation scores. The package's functionality is compromised, leading to potential security risks for applications that depend on it.
Vulnerability Detail
This vulnerability originates from the malicious intent behind the unknown_trout_z3n package, which includes scripts that modify the package.json file to remove private flags and alter version numbers. It generates random package names and continuously republishes variants, polluting the npm registry. The ramifications include unauthorized access to sensitive data, potential exploitation of the affected applications, and a significant increase in the risk of dependency confusion attacks.
How To Fix
This package is malicious. Remove it and rotate any credentials it could have accessed.
npm uninstall unknown_trout_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 unknown_trout_z3n package and replace it with a reputable alternative. Always verify the integrity of packages before including them in your project. For example, you can use the following command to check for outdated packages: 'npm outdated'.
Conclusion
The unknown_trout_z3n package poses a significant security risk due to its malicious code designed to manipulate package metadata and publish unauthorized variants. It is essential to remove this package from your projects and monitor your dependencies for vulnerabilities to maintain the security of your applications.
See every vulnerability recorded for unknown_trout_z3n →
FAQ
The unknown_trout_z3n package is an npm package linked to a malicious campaign aimed at inflating developer reputation scores through the publication of derivative packages.
The vulnerability can lead to unauthorized modifications in your application's dependencies, potentially exposing sensitive data and increasing the risk of exploitation.
If you have installed the unknown_trout_z3n package, you should uninstall it immediately and check for any other affected packages in your project.
You can use tools like Vulert, which monitors your package-lock.json file to alert you in real-time for open-source vulnerabilities without requiring code access or installation.
Yes, you can use the Vulert playground at Vulert Scanner to check if your application is affected by this vulnerability without any signup.
