Malicious Code Detected in cowsay-caps Package - Security Alert

cowsay-caps Updated 02 Feb 2026

Summary

02/02/2026
CRITICAL
No i
Critical
Not published

MAL-2026-631: Malicious code in cowsay-caps (npm). Affected versions are not published. No fix is published. How to fix ↓

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Background

The cowsay-caps package is an npm library that enhances the popular 'cowsay' tool, allowing users to display text in a speech bubble from an ASCII art cow. This package is often used in various applications for fun and creative text display. However, it has been found to contain malicious code, posing a significant security risk to users and applications that rely on it.

Vulnerability Detail

The vulnerability originates from the cowsay-caps package, which was identified to contain malicious code. This code can potentially compromise the security of applications using this package, leading to unauthorized access, data breaches, or other malicious activities. The specific technical details of the malicious code have not been disclosed, but its presence in the package is a serious concern for developers and users alike.

How To Fix

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

npm uninstall cowsay-caps

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

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Workaround

If you cannot update the package immediately, consider removing it from your project or replacing it with a safer alternative. You can uninstall the package using the command: 'npm uninstall cowsay-caps'.

Conclusion

The discovery of malicious code in the cowsay-caps package highlights the importance of maintaining security in open-source software. Users are urged to update or remove the package to mitigate potential risks. Utilizing tools like Vulert can help in monitoring vulnerabilities effectively.

See every vulnerability recorded for cowsay-caps →

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FAQ

Cowsay-caps is an npm package that enhances the cowsay tool, allowing users to display text in a speech bubble from an ASCII art cow.

The specific details of the malicious code have not been disclosed, but it poses a significant security risk to applications using the package.

You can use Vulert, which monitors and alerts for open-source vulnerabilities in your software. Visit Vulert Scanner to check if your application is affected without any signup.

If you cannot update the cowsay-caps package, consider removing it from your project or replacing it with a safer alternative.

Regularly check the package repository for updates and security advisories, and consider using tools like Vulert for real-time monitoring.

How To Fix

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

npm uninstall cowsay-caps

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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