Malicious Code Injection in chaienv Package: A Critical Security Risk
Summary
MAL-2026-17321: Malicious code in chaienv (npm). Affects chaienv versions 1.0.2. No fix is published. How to fix ↓
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Background
The chaienv package, version 1.0.2, is designed as a helper for creating Chai environments in JavaScript applications. It aims to simplify the setup of testing environments but has been found to contain malicious code that poses significant security risks. The package's functionality is overshadowed by its vulnerability, which involves the unconditionally loading of an obfuscated and potentially harmful module.
Vulnerability Detail
The vulnerability stems from the chaienv package's index.js file, which loads lib/config.js at require time without any checks. This file is an extremely large, obfuscated module packed with malicious code, making it a significant security threat. The malicious code is designed to execute upon importing the package, potentially compromising any application that uses chaienv. The package also impersonates a well-known library, making it difficult for users to identify the threat during casual code reviews.
How To Fix
This package is malicious. Remove it and rotate any credentials it could have accessed.
npm uninstall chaienvIf it arrived as a transitive dependency, remove the package that pulled it in, then reinstall.
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Workaround
As a temporary workaround, avoid using the chaienv package and consider using alternative libraries for setting up Chai environments. If you must use chaienv, ensure to audit your code and monitor for any suspicious activity.
Conclusion
The chaienv package poses a significant security risk due to the presence of malicious code that executes upon import. It is essential to remove this package from your projects and monitor for any updates or patches. Utilizing tools like Vulert can help you stay informed about vulnerabilities in your software.
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FAQ
chaienv is a small helper package designed to facilitate the setup of Chai testing environments in JavaScript applications.
The vulnerability allows malicious code to execute upon importing the chaienv package, potentially compromising your application's security and data.
Yes, you can use Vulert, which monitors and alerts for open-source vulnerabilities in your software. You can check your application using the Vulert playground without any signup.
Remove the chaienv package from your project immediately and consider using alternative libraries for your testing needs.
Regularly audit your dependencies using tools like Vulert, which can provide real-time alerts for vulnerabilities in your software.
