Malicious Code Vulnerability in fe-lib-theme Package

fe-lib-theme Updated 19 Mar 2026

Summary

18/03/2026
CRITICAL
No i
Critical
Not published

MAL-2026-1737: Malicious code in fe-lib-theme (npm). Affects fe-lib-theme versions 99.99.9 – 999.999.999. No fix is published. How to fix ↓

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Background

The fe-lib-theme package is a library used in the npm ecosystem, primarily for theming and styling applications. It provides developers with a set of pre-defined styles and components to enhance the user interface of their applications. However, this package has been identified to contain malicious code, posing a significant risk to applications that rely on it.

Vulnerability Detail

The vulnerability in the fe-lib-theme package stems from the inclusion of malicious code that can compromise the security of applications utilizing this library. This code may lead to unauthorized access, data breaches, or other harmful actions within the affected systems. The malicious code was identified in specific versions of the package, including 99.99.9, 99.99.99, and 999.999.999, and is attributed to a source identified by ReversingLabs.

How To Fix

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

npm uninstall fe-lib-theme

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 measure, you can remove the fe-lib-theme package from your project until a secure version is available. Use the following command to uninstall the package: npm uninstall fe-lib-theme. Consider using alternative theming libraries that are known to be secure in the meantime.

Conclusion

The fe-lib-theme package has been identified to contain malicious code, posing a significant risk to applications that utilize it. It is essential to update the package to a secure version and monitor for vulnerabilities to ensure the safety of your application.

See every vulnerability recorded for fe-lib-theme →

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FAQ

fe-lib-theme is an npm package used for theming and styling applications, providing developers with a set of pre-defined styles and components.

You can use Vulert, which monitors and alerts for open-source vulnerabilities in your software. Check your application against the vulnerability using the Vulert playground at Vulert Scanner.

The malicious code in the fe-lib-theme package can lead to unauthorized access, data breaches, and other harmful actions within your application.

Regularly update your dependencies, monitor for vulnerabilities using tools like Vulert, and review the security of third-party packages before integrating them into your application.

Yes, it is recommended to update the fe-lib-theme package to the latest version that does not contain the malicious code. Use npm install fe-lib-theme@latest to update.

How To Fix

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

npm uninstall fe-lib-theme

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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