Critical Malicious Code Vulnerability in transform-proto-to-assign Package

transform-proto-to-assign Updated 18 Mar 2026

Summary

18/03/2026
CRITICAL
No i
Critical
Not published

MAL-2026-1573: Malicious code in transform-proto-to-assign (npm). Affected versions are not published. No fix is published. How to fix ↓

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Background

The transform-proto-to-assign package is an npm library designed to facilitate the transformation of prototype properties into assignable objects. It is commonly used in JavaScript applications to enhance object manipulation capabilities. However, this package has been identified as containing malicious code, posing significant security risks to any system utilizing it.

Vulnerability Detail

The vulnerability stems from the presence of embedded malicious code within the transform-proto-to-assign package. This code can compromise any computer that has the package installed, potentially allowing unauthorized access to sensitive information such as secrets and keys. The origin of this vulnerability is linked to the package's malicious nature, which has been confirmed by security researchers. Users are advised to treat any system running this package as fully compromised.

How To Fix

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

npm uninstall transform-proto-to-assign

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

There are no effective workarounds for this vulnerability other than removing the package and securing your system. It is essential to monitor your application for any signs of compromise after the removal.

Conclusion

The transform-proto-to-assign package poses a severe security risk due to embedded malicious code. Immediate action is required to remove the package and secure any sensitive information. Utilizing tools like Vulert can help monitor for such vulnerabilities in the future.

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FAQ

It is an npm library used for transforming prototype properties into assignable objects in JavaScript applications.

If you have the transform-proto-to-assign package installed, your system is at risk. You can use Vulert to monitor and alert for vulnerabilities in real-time.

Immediately rotate all secrets and keys stored on the affected computer from a different, secure machine.

No, there is no patched version available for the transform-proto-to-assign package. The best course of action is to uninstall it.

Vulert monitors your package-lock.json file to alert you in real-time about open-source vulnerabilities, ensuring your software remains secure.

How To Fix

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

npm uninstall transform-proto-to-assign

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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