Malicious Code Injection in important_jellyfish_z3n Package
Summary
MAL-2025-103996: Malicious code in important_jellyfish_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 important_jellyfish_z3n package is part of the npm ecosystem, often used in JavaScript projects. It is associated with the tea.xyz token reward campaign, which has been linked to a series of malicious packages flooding the npm registry. These packages are designed to manipulate developer reputation scores through automated publishing of derivative packages.
Vulnerability Detail
This vulnerability originates from the malicious intent behind the important_jellyfish_z3n package, which contains scripts that modify the package.json file to remove private flags, alter version numbers, and generate random package names. The continuous republishing of these variants leads to pollution of the npm registry, potentially compromising the integrity of projects that depend on this package. The ramifications include loss of control over package versions, exposure to further malicious code, and damage to developer reputation.
How To Fix
This package is malicious. Remove it and rotate any credentials it could have accessed.
npm uninstall important_jellyfish_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, avoid using the important_jellyfish_z3n package and consider using alternative packages that provide similar functionality without the associated risks.
Conclusion
The important_jellyfish_z3n package poses a significant risk due to its malicious code designed to manipulate npm registry practices. It is essential to remove this package from your projects and monitor for any potential vulnerabilities using tools like Vulert.
See every vulnerability recorded for important_jellyfish_z3n →
FAQ
important_jellyfish_z3n is an npm package that has been identified as malicious, designed to manipulate npm registry and developer reputation.
You can use Vulert's playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
Using this package can lead to exposure to malicious code, loss of control over package versions, and potential damage to your project's integrity.
Regularly audit your dependencies and use tools like Vulert to monitor for vulnerabilities in your open-source packages.
Immediately uninstall the package and replace it with a safer alternative. Monitor your project for any unusual behavior.
