Malicious Code Detected in node-calculator-f209 Package - Security Risk Alert

node-calculator-f209 Updated 19 Nov 2025

Summary

17/11/2025
CRITICAL
No i
Critical
Not published

MAL-2025-190545: Malicious code in node-calculator-f209 (npm). Affected versions are not published. No fix is published. How to fix ↓

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Background

The node-calculator-f209 package is an npm library designed for performing basic arithmetic calculations. It is commonly used in JavaScript applications to facilitate mathematical operations. However, this package has been identified as containing malicious code, which poses a significant security risk to applications that utilize it.

Vulnerability Detail

The vulnerability originates from the inclusion of malicious code within the node-calculator-f209 package. This code can potentially compromise the security of applications that depend on it, leading to unauthorized access, data breaches, or other malicious activities. The malicious code was identified by Amazon Inspector, highlighting the importance of monitoring dependencies for security threats.

How To Fix

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

npm uninstall node-calculator-f209

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 workaround, you can avoid using the node-calculator-f209 package altogether and implement basic arithmetic functions directly in your code. For example: function add(a, b) { return a + b; } function subtract(a, b) { return a - b; } function multiply(a, b) { return a * b; } function divide(a, b) { return a / b; }

Conclusion

The discovery of malicious code in the node-calculator-f209 package underscores the importance of vigilance in managing open-source dependencies. By promptly addressing this vulnerability through updates and monitoring, developers can safeguard their applications against potential threats.

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FAQ

It is an npm library used for performing arithmetic calculations in JavaScript applications.

The specific nature of the malicious code has not been disclosed, but it poses a security risk to applications using the package.

You can use Vulert to monitor your application for vulnerabilities. Simply upload your package-lock.json file to receive real-time alerts.

Regularly update your dependencies and use tools like Vulert to monitor for vulnerabilities in your open-source packages.

Consider implementing a workaround by using custom arithmetic functions instead of relying on the vulnerable package.

How To Fix

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

npm uninstall node-calculator-f209

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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