Malicious Code Detected in fuimonos Package - Security Alert
Summary
MAL-2025-21035: Malicious code in fuimonos (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 fuimonos package is a JavaScript library available on npm that is designed for various functionalities in web development. It is widely used for its ease of integration and utility features. However, recent findings have revealed that this package contains malicious code, posing significant security risks to applications that depend on it.
Vulnerability Detail
The vulnerability in the fuimonos package originates from the inclusion of malicious code that can compromise the security of applications utilizing this library. This malicious code can lead to unauthorized access, data breaches, or other harmful actions within the application environment. The issue affects all versions starting from 0, making it critical for users to take immediate action to mitigate potential risks.
How To Fix
This package is malicious. Remove it and rotate any credentials it could have accessed.
npm uninstall fuimonosIf 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, consider removing the fuimonos package from your project until a secure version is released. You can do this by running the command: 'npm uninstall fuimonos'. This action will prevent the execution of the malicious code until a fix is implemented.
Conclusion
The discovery of malicious code in the fuimonos package presents a serious security concern for developers and users. Immediate action is required to update or remove the package to protect applications from potential threats. Utilizing tools like Vulert can help in monitoring and managing vulnerabilities effectively.
See every vulnerability recorded for fuimonos →
FAQ
fuimonos is a JavaScript library available on npm, used for various web development functionalities.
The malicious code can lead to unauthorized access and potential data breaches in applications using the package.
You can use Vulert, which monitors and alerts for open-source vulnerabilities in real-time. Visit Vulert Scanner to check your application without needing to sign up.
If an immediate update is not possible, consider uninstalling the package as a temporary measure to mitigate risks.
Detailed information can be found in the vulnerability report on GitHub: https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/fuimonos/MAL-2025-21035.json.
