Critical Malicious Code Vulnerability in codex-setup Package

codex-setup Updated 20 Oct 2026

Summary

19/10/2026
CRITICAL
No i
Critical
Not published

MAL-2026-18060: Malicious code in codex-setup (npm). Affected versions are not published. No fix is published. How to fix ↓

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Background

The codex-setup package is a tool used in the npm ecosystem for setting up development environments and managing configurations. It is designed to streamline the setup process for developers, allowing them to quickly configure their projects. However, this package has been identified as containing malicious code, posing significant security risks to any system where it is installed.

Vulnerability Detail

The vulnerability stems from the presence of embedded malicious code within the codex-setup package. This code can compromise the entire system, allowing unauthorized access to sensitive information such as secrets and keys. The origin of this vulnerability is linked to a malicious actor who has inserted harmful code into the package, which can lead to full control of the affected computer. Users should consider any system with this package installed as fully compromised, necessitating immediate action to secure their data.

How To Fix

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

npm uninstall codex-setup

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

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Workaround

There are no direct workarounds for this vulnerability other than removing the package. Ensure that you monitor your system for any unusual activity after removal.

Conclusion

The codex-setup package has been identified as containing malicious code, which poses serious security threats to any system where it is installed. Immediate removal of the package and rotation of sensitive information is essential to mitigate risks. Utilizing tools like Vulert can help in monitoring for such vulnerabilities in the future.

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FAQ

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

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

Keeping codex-setup installed poses significant risks, including unauthorized access to your system and potential data breaches.

Regularly monitor your dependencies using tools like Vulert, which can alert you to vulnerabilities in real-time.

Vulert is a tool that monitors and alerts for open-source vulnerabilities in your software using just the package-lock.json file, ensuring you stay informed about potential risks.

Sponsored Lume, the Habilume companion Habilume Habit tracker with a companion that grows with you Complete habits, earn Lume Points, and watch your Lume grow as you stay consistent. App Store Google Play

How To Fix

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

npm uninstall codex-setup

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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