Malicious Code Exposure in stubsoutagn Package: A Security Concern

stubsoutagn Updated 03 Dec 2025

Summary

07/06/2025
CRITICAL
No i
Critical
Not published

MAL-2025-191880: Malicious code in stubsoutagn (PyPI). Affected versions are not published. No fix is published. How to fix ↓

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Background

The stubsoutagn package, available on PyPI, is designed for telemetry purposes. However, it has been found to contain malicious code that compromises user privacy by exfiltrating sensitive information from the environment. This vulnerability raises significant concerns regarding the security of applications that rely on this package.

Vulnerability Detail

The vulnerability originates from the stubsoutagn package, which, while marketed as a telemetry tool, secretly attempts to send out sensitive environmental variables and basic system information, such as IP addresses and usernames. This malicious behavior poses a risk of data leakage and unauthorized access to user information, making it a clear infostealer threat.

How To Fix

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

pip uninstall stubsoutagn

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 measure, you can avoid using the stubsoutagn package in your project until a secure alternative is identified. Additionally, consider implementing environment variable protection mechanisms to safeguard sensitive information.

Conclusion

The stubsoutagn package poses a significant security risk due to its malicious code that exfiltrates sensitive information. Users are urged to remove the package and monitor for updates. Utilizing tools like Vulert can help in identifying vulnerabilities in your applications.

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FAQ

The stubsoutagn package is a telemetry tool available on PyPI, which has been found to contain malicious code that exfiltrates sensitive information.

The vulnerability allows the package to send out sensitive data from your environment, potentially leading to unauthorized access and data breaches.

It is advisable to uninstall the stubsoutagn package immediately and monitor for any updates or patches from the maintainers.

Yes, Vulert can monitor and alert you in real-time for open-source vulnerabilities in your software without requiring access to the code or installation.

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

How To Fix

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

pip uninstall stubsoutagn

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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