Critical Malicious Code Vulnerability in syntax-jsx Package
Summary
MAL-2026-575: Malicious code in syntax-jsx (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
Habilume
Habit tracker with a companion that grows with you
Complete habits, earn Lume Points, and watch your Lume grow as you stay consistent.
Background
The syntax-jsx package is a JavaScript library used for parsing and transforming JSX syntax in React applications. It is designed to facilitate the integration of JSX into JavaScript code, enhancing the development experience for React developers. However, this package has been compromised, leading to severe security implications for users who have it installed.
Vulnerability Detail
The vulnerability stems from the presence of malicious code embedded within the syntax-jsx package. This code can fully compromise any computer that has the package installed, allowing unauthorized access to sensitive information such as secrets and keys. The malicious nature of this code is classified under CWE-506, indicating that it contains code that appears to be malicious in nature. Users are advised to consider their systems compromised and take immediate action.
How To Fix
This package is malicious. Remove it and rotate any credentials it could have accessed.
npm uninstall syntax-jsxIf 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
There are no effective workarounds for this vulnerability other than removing the package entirely. Ensure that all secrets and keys stored on the affected computer are rotated immediately from a different, secure computer.
Conclusion
The syntax-jsx package has been compromised with malicious code, posing significant security risks to users. Immediate action is required to uninstall the package and secure any sensitive information. Regular monitoring of dependencies using tools like Vulert can help prevent future vulnerabilities.
See every vulnerability recorded for syntax-jsx →
FAQ
You should immediately uninstall the syntax-jsx package and rotate any secrets or keys stored on your computer.
You can use Vulert's playground at Vulert Scanner to check if your application is affected by this vulnerability without requiring any signup.
Failing to address this vulnerability can lead to unauthorized access to sensitive information and potential full control of your computer by malicious actors.
Currently, there is no patch available. The recommended action is to uninstall the package until a secure version is released.
Vulert monitors and alerts users in real-time for open-source vulnerabilities using just the package-lock.json file, providing a proactive approach to security.
References
Habilume
Habit tracker with a companion that grows with you
Complete habits, earn Lume Points, and watch your Lume grow as you stay consistent.
