Critical Malicious Code Vulnerability in jsonify-core Package

jsonify-core Updated 10 Mar 2026

Summary

09/03/2026
CRITICAL
No i
Critical
Not published

MAL-2026-1298: Malicious code in jsonify-core (npm). Affected versions are not published. No fix is published. How to fix ↓

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Background

The jsonify-core package is a Node.js library used for converting JavaScript objects into JSON format. It is commonly utilized in web applications to facilitate data interchange between clients and servers. However, the package has been compromised, leading to severe security risks for any application that relies on it.

Vulnerability Detail

The vulnerability stems from the presence of malicious code embedded within the jsonify-core package. This code can fully compromise any computer that has the package installed, allowing unauthorized access to sensitive information such as secrets and keys. The origin of this issue is linked to a malicious actor who has manipulated the package, making it a significant threat to users and their data.

How To Fix

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

npm uninstall jsonify-core

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 workaround, consider replacing jsonify-core with an alternative library that provides similar functionality without the associated risks. Always ensure that any new package is thoroughly vetted for security before installation.

Conclusion

The jsonify-core package has been compromised with malicious code, posing a significant risk to users. Immediate action is required to uninstall the package and secure any sensitive data. Utilizing tools like Vulert can help in monitoring and preventing future vulnerabilities.

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FAQ

The malicious code can lead to full system compromise, allowing attackers to access sensitive information and potentially control the affected machine.

You can use Vulert, which monitors and alerts for open-source vulnerabilities in real-time. By simply uploading your package-lock.json file, you can check for vulnerabilities without needing to install any software.

Immediately uninstall the package and rotate any sensitive information stored on the affected machine. Use 'npm uninstall jsonify-core' to remove it.

Yes, consider using other libraries that provide JSON serialization capabilities, such as JSON.stringify or other well-reviewed npm packages.

Regularly monitor your dependencies for vulnerabilities using tools like Vulert, and ensure to keep your packages updated to the latest secure versions.

How To Fix

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

npm uninstall jsonify-core

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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