Malicious Code Injection in spontaneous_guan_z3n Package - npm Vulnerability

spontaneous_guan_z3n Updated 18 Nov 2025

Summary

11/11/2025
CRITICAL
No i
Critical
Not published

MAL-2025-109026: Malicious code in spontaneous_guan_z3n (npm). Affected versions are not published. No fix is published. How to fix ↓

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Background

The spontaneous_guan_z3n package is part of the npm ecosystem and is associated with the tea.xyz token reward campaign. This package is designed to facilitate the automatic generation and publication of derivative packages, often with randomized names, to inflate developer reputation scores for token rewards. Its functionality, while seemingly innocuous, has been exploited to introduce malicious behavior that compromises the integrity of the npm registry.

Vulnerability Detail

The vulnerability originates from the package's design, which includes autopublish scripts that modify the package.json file to remove private flags, alter version numbers, and generate random package names. This behavior leads to the continuous republishing of variants, effectively polluting the npm registry. The malicious payload can result in developers inadvertently using compromised packages, which may lead to security breaches or loss of control over their projects.

How To Fix

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

npm uninstall spontaneous_guan_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 →

Workaround

As a temporary workaround, you can avoid using the spontaneous_guan_z3n package and any packages that depend on it. Additionally, consider using package-lock.json to monitor your dependencies for vulnerabilities. Tools like Vulert can help you identify if your application is affected by this vulnerability without requiring code access or installation.

Conclusion

The spontaneous_guan_z3n package poses a significant risk due to its malicious code injection capabilities. It is crucial for developers to be aware of this vulnerability, remove the affected package, and utilize monitoring tools like Vulert to safeguard their projects against potential threats.

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FAQ

spontaneous_guan_z3n is an npm package associated with the tea.xyz token reward campaign, designed to automate the publication of derivative packages.

The vulnerability can lead to the introduction of malicious code into your project, potentially compromising security and functionality.

You should remove the spontaneous_guan_z3n package from your project and check for any dependencies that may also be affected.

Yes, you can use tools like Vulert, which monitors your package-lock.json for vulnerabilities in real-time without requiring code access.

Regularly update your packages, review security advisories, and utilize tools like Vulert to monitor for vulnerabilities.

Sponsored Lume, the Habilume companion Habilume Habit tracker with a companion that grows with you Complete habits, earn Lume Points, and watch your Lume grow as you stay consistent. App Store Google Play

How To Fix

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

npm uninstall spontaneous_guan_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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