Malicious Code Detected in cirrus-webserver Package
Summary
MAL-2025-17053: Malicious code in cirrus-webserver (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 cirrus-webserver package is a Node.js web server designed for simplicity and ease of use. It allows developers to quickly set up a web server for their applications. However, it has been identified to contain malicious code, which poses a significant security risk to users who rely on this package for their web server needs.
Vulnerability Detail
The vulnerability in the cirrus-webserver package stems from the inclusion of malicious code that can compromise the security of applications utilizing this package. This malicious code can lead to unauthorized access, data breaches, and potential exploitation of the server environment. The issue was introduced in version 0 and affects all subsequent versions, making it critical for users to take immediate action.
How To Fix
This package is malicious. Remove it and rotate any credentials it could have accessed.
npm uninstall cirrus-webserverIf 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, users can remove the cirrus-webserver package from their project and replace it with an alternative web server package that does not have known vulnerabilities. This can be done by running: npm uninstall cirrus-webserver.
Conclusion
The cirrus-webserver package has been found to contain malicious code, posing a significant risk to users. It is crucial to update to a patched version or consider alternative packages to ensure the security of your applications. Regular monitoring for vulnerabilities is recommended to maintain a secure development environment.
See every vulnerability recorded for cirrus-webserver →
FAQ
The cirrus-webserver package is a lightweight Node.js web server that allows developers to quickly set up and run web applications.
The malicious code was identified through security audits and reports from tools like Amazon Inspector, which flagged the package for containing harmful elements.
Using the affected version of cirrus-webserver can lead to unauthorized access, data leaks, and exploitation of the server, putting both the application and its users at risk.
Yes, tools like Vulert can monitor your package-lock.json file to alert you in real-time about open-source vulnerabilities in your software.
You can use the Vulert playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
