Malicious Code Detected in fsworker Package - Security Alert
Summary
MAL-2025-21018: Malicious code in fsworker (npm). Affected versions are not published. No fix is published. How to fix ↓
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Background
The fsworker package is an npm module designed to facilitate file system operations in Node.js applications. It provides various functionalities to manage file and directory interactions efficiently. However, recent investigations have revealed that this package contains malicious code, posing significant security risks to applications that utilize it.
Vulnerability Detail
The fsworker package has been identified to contain malicious code that could compromise the security of applications using it. This vulnerability originated from the package's codebase, which was found to be intentionally designed to execute harmful operations. The ramifications of this vulnerability include unauthorized access to sensitive data, potential data corruption, and exploitation of the host system. Developers using this package are urged to take immediate action to mitigate risks associated with this malicious code.
How To Fix
This package is malicious. Remove it and rotate any credentials it could have accessed.
npm uninstall fsworkerIf it arrived as a transitive dependency, remove the package that pulled it in, then reinstall.
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Workaround
As a temporary workaround, it is advisable to remove the fsworker package from your project until a secure version is released. You can do this by executing the following command: npm uninstall fsworker. Consider using alternative packages that provide similar functionality without the associated risks.
Conclusion
The fsworker package has been flagged for containing malicious code, which poses serious security threats to applications. It is essential for developers to take immediate action by updating or removing the package and to monitor their projects for vulnerabilities using tools like Vulert.
See every vulnerability recorded for fsworker →
FAQ
The fsworker package is an npm module used for file system operations in Node.js applications.
The malicious code was discovered through security audits conducted by Amazon Inspector, which identified vulnerabilities in the package.
Using the fsworker package can lead to unauthorized access to sensitive data, data corruption, and exploitation of the host system.
You can use Vulert to monitor and alert in real-time for open-source vulnerabilities in your software. It requires only the 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 any signup.
