Malicious Code Detected in avalon-plugin-builder: A Critical Vulnerability

avalon-plugin-builder Updated 02 Oct 2025

Summary

14/08/2025
CRITICAL
No i
Critical
Not published

MAL-2025-15176: Malicious code in avalon-plugin-builder (npm). Affected versions are not published. No fix is published. How to fix ↓

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Background

The package 'avalon-plugin-builder' is a tool designed for building plugins within the Avalon framework. It is utilized by developers to streamline the process of creating and managing plugins, offering features such as plugin scaffolding and dependency management. However, this package has been found to contain malicious code, posing significant risks to users who incorporate it into their projects.

Vulnerability Detail

The vulnerability stems from the presence of malicious code within the 'avalon-plugin-builder' package. This code can potentially compromise the security of applications that utilize this package, leading to unauthorized access, data breaches, or other malicious activities. The issue was introduced in version 0 and affects all subsequent versions, making it critical for users to address this vulnerability promptly.

How To Fix

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

npm uninstall avalon-plugin-builder

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, users are advised to remove the 'avalon-plugin-builder' package from their projects until a secure version is released. This can be done using the command: 'npm uninstall avalon-plugin-builder'.

Conclusion

The discovery of malicious code in the 'avalon-plugin-builder' package highlights the importance of vigilance in managing open-source dependencies. Users are strongly encouraged to update or remove the affected package to mitigate risks associated with this vulnerability.

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FAQ

The malicious code can perform unauthorized actions within applications, potentially leading to data theft or system compromise.

You can use Vulert's playground at Vulert Scanner to check if your application is affected without needing to sign up.

If immediate updates are not possible, consider removing the package as a temporary measure until a secure version is available.

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

Using the compromised package can lead to severe security risks, including unauthorized access to sensitive data and potential exploitation of your application.

How To Fix

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

npm uninstall avalon-plugin-builder

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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