Malicious Code Detected in clasker Package - Security Alert

clasker Updated 02 Oct 2025

Summary

14/08/2025
CRITICAL
No i
Critical
Not published

MAL-2025-17094: Malicious code in clasker (npm). Affected versions are not published. No fix is published. How to fix ↓

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Background

The clasker package is an npm library designed for specific functionalities within JavaScript applications. It is utilized for various tasks, including data handling and processing. However, the package has been identified to contain malicious code, posing significant security risks to applications that depend on it.

Vulnerability Detail

The vulnerability in the clasker package stems from the inclusion of malicious code that can compromise the integrity and security of applications using this package. This issue was introduced in version 0 and affects all subsequent versions. The ramifications of this vulnerability include unauthorized access to sensitive data, potential data corruption, and exploitation of the application environment by malicious actors.

How To Fix

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

npm uninstall clasker

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, consider using alternative packages that provide similar functionalities without the associated risks. Always ensure to review the security status of any package before integrating it into your project.

Conclusion

The clasker package has been identified as containing malicious code, posing a significant security risk to applications. It is essential to uninstall the package and monitor for updates or alternative solutions to safeguard your projects.

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FAQ

The clasker package is an npm library used for various data handling tasks in JavaScript applications.

The malicious code can compromise application security, allowing unauthorized access and potential data corruption.

You can use Vulert's playground at Vulert Scanner to check if your application is affected by this vulnerability without any signup.

You should uninstall the clasker package immediately and consider using alternative packages until a secure version is released.

Yes, Vulert can monitor and alert you in real-time for open-source vulnerabilities in your software using just package-lock.json.

How To Fix

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

npm uninstall clasker

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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