Critical Malicious Code Vulnerability in lyonscg Package
Summary
MAL-2026-212: Malicious code in lyonscg (npm). Affected versions are not published. No fix is published. How to fix ↓
Check if this vulnerability affects your application
Upload a manifest or SBOM and we'll show whether you're affected, plus every other risky package in the same scan.
No signup required · Results in about 60 seconds
Background
The lyonscg package is a Node.js library commonly used in web development for various functionalities. It is designed to facilitate specific tasks within applications, providing developers with tools to enhance their projects. However, this package has been identified as containing malicious code, posing significant risks to systems that utilize it.
Vulnerability Detail
The vulnerability stems from the presence of embedded malicious code within the lyonscg package. This code can compromise any computer that has the package installed, allowing unauthorized access to sensitive information such as secrets and keys. The origin of this issue is linked to the package being flagged as malicious by security researchers, indicating that it may have been intentionally designed to exploit users. The ramifications of this vulnerability are severe, as it can lead to complete system compromise and data breaches.
How To Fix
This package is malicious. Remove it and rotate any credentials it could have accessed.
npm uninstall lyonscgIf 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
Currently, there are no effective workarounds to mitigate the risks associated with the lyonscg package. The best course of action is to uninstall the package entirely.
Conclusion
The lyonscg package has been identified as containing malicious code that poses a significant threat to systems using it. Immediate action is required to uninstall the package and secure any sensitive information. Regular monitoring of your dependencies is essential to prevent future vulnerabilities.
See every vulnerability recorded for lyonscg →
FAQ
You should uninstall the lyonscg package immediately and rotate any sensitive information stored on the affected system.
You can use the Vulert playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
No, there is currently no patched version of the lyonscg package available. The only solution is to uninstall it.
Failing to remove the package can lead to complete system compromise, unauthorized access to sensitive data, and potential data breaches.
You can use Vulert, which monitors and alerts in real-time for open-source vulnerabilities using just your package-lock.json file.
