Malicious Code Detected in calcool Package - Security Alert

calcool Updated 02 Oct 2025

Summary

14/08/2025
CRITICAL
No i
Critical
Not published

MAL-2025-16445: Malicious code in calcool (npm). Affected versions are not published. No fix is published. How to fix ↓

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Background

The calcool package is a Node.js library designed for performing various mathematical calculations. It is commonly used in applications that require arithmetic operations and data processing. However, recent findings have revealed that this package contains malicious code that can compromise the security of applications utilizing it.

Vulnerability Detail

The vulnerability in the calcool package stems from the inclusion of malicious code that can execute harmful actions on the user's system. This code can lead to unauthorized access, data theft, or other malicious activities. The issue was introduced in version 0 of the package and poses a significant risk to any application that relies on it. Users are advised to take immediate action to mitigate potential damage.

How To Fix

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

npm uninstall calcool

If it arrived as a transitive dependency, remove the package that pulled it in, then reinstall.

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Workaround

As a temporary workaround, users can remove the calcool package from their project until a secure version is released. This can be done by executing the command: 'npm uninstall calcool'.

Conclusion

The calcool package has been identified as containing malicious code that poses a significant security risk. Users are strongly encouraged to update or remove the package to protect their applications. Utilizing tools like Vulert can help in monitoring and managing open-source vulnerabilities effectively.

See every vulnerability recorded for calcool →

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FAQ

Calcool is a Node.js library used for performing mathematical calculations in applications.

The malicious code can execute harmful actions, potentially leading to unauthorized access and data theft.

You can use Vulert to monitor and alert for open-source vulnerabilities in your software. Visit Vulert Scanner to check if your application is affected without requiring any signup.

As a temporary measure, you can uninstall the calcool package to prevent any potential security risks.

Using tools like Vulert, which monitors your package-lock.json for vulnerabilities in real-time, can help you stay informed.

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How To Fix

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

npm uninstall calcool

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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