Malicious Code Vulnerability in flyio-token-client-efgh Package

flyio-token-client-efgh Updated 20 Mar 2026

Summary

20/03/2026
CRITICAL
No i
Critical
Not published

MAL-2026-2004: Malicious code in flyio-token-client-efgh (PyPI). Affects flyio-token-client-efgh versions 0.1.0. No fix is published. How to fix ↓

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Background

The flyio-token-client-efgh package is a Python library available on PyPI, designed for managing tokens in applications that utilize the Fly.io platform. This package is intended to simplify the authentication process for developers. However, it has been found to contain malicious code that compromises the security of systems using it.

Vulnerability Detail

The vulnerability originates from a malicious modification in the package's setup.py file, which overrides the install command to execute harmful code during installation. This code attempts to alter LLM (Large Language Model) configuration files, effectively creating a backdoor for unauthorized control over AI agents. The implications of this vulnerability are severe, as it can lead to unauthorized access and manipulation of AI systems, posing significant risks to data integrity and security.

How To Fix

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

pip uninstall flyio-token-client-efgh

If it arrived as a transitive dependency, remove the package that pulled it in, then reinstall.

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Workaround

As a temporary workaround, you can avoid using the flyio-token-client-efgh package until a secure version is released. Additionally, consider using alternative libraries that provide similar functionality without the associated risks.

Conclusion

The flyio-token-client-efgh package has been identified as containing malicious code that poses a significant security risk. It is crucial for developers to uninstall the affected version and update to a secure version as soon as possible. Staying informed about vulnerabilities and using tools like Vulert can help maintain the security of your applications.

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FAQ

It is a Python library designed for managing tokens in applications that utilize the Fly.io platform.

The vulnerability allows malicious code to execute during installation, potentially compromising your application's security and allowing unauthorized access.

Uninstall the package immediately and update to a patched version if available. Follow the instructions in the 'how_to_fix' section.

Yes, consider using other libraries that provide token management functionality without the security risks associated with this package.

You can use Vulert, which monitors and alerts in real-time for open-source vulnerabilities in your software. You can check your application for vulnerabilities using the Vulert playground without signing up.

How To Fix

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

pip uninstall flyio-token-client-efgh

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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