Critical Malicious Code Vulnerability in jsonslicer Package

jsonslicer Updated 02 Oct 2025

Summary

15/07/2025
CRITICAL
No i
Critical
Not published

MAL-2025-5930: Malicious code in jsonslicer (npm). Affected versions are not published. No fix is published. How to fix ↓

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Background

The jsonslicer package is an npm library designed for parsing and manipulating JSON data. It offers functionalities that allow developers to easily extract and transform JSON structures. However, this package has been identified to contain malicious code that compromises the security of systems where it is installed, making it a significant risk for developers and organizations relying on it.

Vulnerability Detail

The vulnerability stems from the presence of embedded malicious code within the jsonslicer package. This code can lead to complete system compromise, allowing unauthorized access to sensitive information such as secrets and keys stored on the affected machine. The malicious nature of this code is classified under CWE-506, indicating that it appears to be intentionally harmful. Users who have this package installed should consider their systems fully compromised, as the removal of the package may not eliminate all traces of the malicious software.

How To Fix

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

npm uninstall jsonslicer

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

Currently, there are no effective workarounds to mitigate the risks posed by the jsonslicer package. The best course of action is to uninstall the package and secure the system.

Conclusion

The jsonslicer package has been identified as containing malicious code that poses a serious security threat. Immediate action is required to remove the package and secure any compromised systems. Utilizing tools like Vulert can help in monitoring and managing vulnerabilities in open-source software.

See every vulnerability recorded for jsonslicer →

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FAQ

You should immediately uninstall the jsonslicer package and rotate any sensitive information stored on your system.

You can use Vulert, which monitors and alerts for open-source vulnerabilities in real-time. Check your application using the Vulert playground at Vulert Scanner without any signup.

Keeping jsonslicer installed poses a significant risk as it can lead to unauthorized access and potential data breaches.

While removing the package is essential, there is no guarantee that all malicious software will be eliminated. It is advisable to perform a thorough security audit of your system.

You can visit the Vulert website for comprehensive monitoring and alerts regarding open-source vulnerabilities.

How To Fix

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

npm uninstall jsonslicer

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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