Malicious Code Vulnerability in dotenv-mono-cli Package
Summary
MAL-2026-1712: Malicious code in dotenv-mono-cli (npm). Affects dotenv-mono-cli versions 3.3.5. No fix is published. How to fix ↓
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Background
dotenv-mono-cli is a Node.js package designed to load environment variables from a .env file into process.env, facilitating configuration management for applications. It is widely used in JavaScript projects to streamline the handling of sensitive information such as API keys and database credentials. However, the package has been identified to contain malicious code that poses significant security risks to users.
Vulnerability Detail
The vulnerability in dotenv-mono-cli arises from the presence of malicious code that can execute harmful actions on the user's system. This code can potentially lead to unauthorized access to sensitive data, data corruption, or even system compromise. The malicious nature of this code was identified by security researchers from ReversingLabs, who reported the issue on March 18, 2026. The affected version is 3.3.5, and users are urged to take immediate action 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 dotenv-mono-cliIf it arrived as a transitive dependency, remove the package that pulled it in, then reinstall.
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Workaround
As a temporary workaround, users can remove the dotenv-mono-cli package from their project until a safe version is confirmed. This can be done using the following command:
npm uninstall dotenv-mono-cli
This will prevent any potential exploitation of the malicious code while you seek an alternative solution.
Conclusion
The dotenv-mono-cli package has been found to contain malicious code that poses significant risks to users. It is crucial to update the package to the latest version or uninstall it until a safe version is available. Utilizing tools like Vulert can help monitor and alert for such vulnerabilities in real-time.
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FAQ
dotenv-mono-cli is a Node.js package that helps developers manage environment variables in their applications by loading them from a .env file.
The malicious code can execute harmful actions on the user's system, potentially leading to unauthorized access to sensitive data or system compromise.
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 needing to sign up.
If you cannot update the package right away, consider uninstalling it temporarily to mitigate the risk of exploitation.
The vulnerability was reported by security researchers from ReversingLabs, who specialize in identifying and analyzing malicious software.
