Malicious Code Detected in filter-stack Package - Security Alert
Summary
MAL-2025-20557: Malicious code in filter-stack (npm). Affected versions are not published. No fix is published. How to fix ↓
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Background
The filter-stack package is a utility in the npm ecosystem that allows developers to create middleware stacks for Node.js applications. It is designed to enhance the modularity and reusability of middleware functions. However, recent findings have revealed that this package contains malicious code, posing significant security risks to applications that utilize it.
Vulnerability Detail
The vulnerability in the filter-stack package originates from the inclusion of malicious code that can compromise the security of applications using this package. This code can potentially lead to unauthorized access, data breaches, or other malicious activities. The issue affects all versions starting from 0, making it critical for developers to address this vulnerability promptly.
How To Fix
This package is malicious. Remove it and rotate any credentials it could have accessed.
npm uninstall filter-stackIf it arrived as a transitive dependency, remove the package that pulled it in, then reinstall.
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Workaround
As a temporary workaround, you can remove the filter-stack package from your project until a safe version is confirmed. Use the following command to uninstall it: npm uninstall filter-stack.
Conclusion
The discovery of malicious code in the filter-stack package poses a serious threat to applications utilizing it. Developers are urged to update to a patched version or remove the package to ensure the security of their applications. Utilizing tools like Vulert can help monitor for such vulnerabilities in real-time.
See every vulnerability recorded for filter-stack →
FAQ
The filter-stack package is used to create middleware stacks in Node.js applications, enhancing modularity and reusability.
You can check if your application is affected by using Vulert, which monitors and alerts for open-source vulnerabilities. Visit Vulert Scanner to use the Vulert playground without signup.
The malicious code can lead to unauthorized access, data breaches, and other harmful activities that compromise application security.
Yes, updating to a patched version of the filter-stack package will resolve the vulnerability. Use 'npm update filter-stack' to update.
If immediate updates are not possible, consider uninstalling the package as a temporary workaround to mitigate risks.
