Malicious Code Detected in Coffescript Package - MAL-2025-17264

coffescript Updated 02 Oct 2025

Summary

14/08/2025
CRITICAL
No i
Critical
Not published

MAL-2025-17264: Malicious code in coffescript (npm). Affected versions are not published. No fix is published. How to fix ↓

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Background

Coffescript is an npm package that is designed to provide a simplified syntax for writing JavaScript. It allows developers to write cleaner and more concise code, making it easier to manage complex applications. However, the package has been found to contain malicious code, which poses a significant risk to users and their applications.

Vulnerability Detail

The vulnerability in the Coffescript package originates from the inclusion of malicious code that can compromise the security of applications utilizing this package. This malicious code can lead to unauthorized access, data breaches, and potential exploitation of the affected systems. Users of Coffescript should be aware that any version from the introduction point (0) onwards is affected, and immediate action is required to mitigate the risks associated with this vulnerability.

How To Fix

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

npm uninstall coffescript

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 can remove the Coffescript package from their project until a secure version is released. You can do this by executing the following command: npm uninstall coffescript. This will help mitigate the risk of exposure to the malicious code.

Conclusion

The Coffescript package has been identified as containing malicious code, which poses a serious threat to users. It is crucial to take immediate action by updating or uninstalling the package to protect your applications. Stay informed about updates and utilize tools like Vulert to monitor for vulnerabilities.

See every vulnerability recorded for coffescript →

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FAQ

Coffescript is an npm package that simplifies JavaScript syntax, allowing developers to write cleaner and more manageable code.

The malicious code can lead to unauthorized access and data breaches, posing significant security risks to applications using the package.

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

As of now, a patched version has not been released. Users should monitor the official repository for updates.

If an immediate update is not possible, consider uninstalling the package as a temporary workaround to mitigate risks.

Related vulnerabilities

Recent vulnerabilities recorded for coffescript.

How To Fix

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

npm uninstall coffescript

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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