The path-addon-extend package for npm pretends to be the Node.js core path module but contains malicious behavior. Upon loading, it decodes a base64 string to obtain a URL pointing to a public JSON-bin service. It fetches data from this URL and executes the content field using eval(), which allows arbitrary code execution in any process that imports this package. Because the JSON-bin is publicly mutable by anyone with the token, an attacker can change the code executed at runtime, posing a severe remote code execution risk. This behavior is concealed by storing the URL as a base64-encoded string decoded at runtime.

Any application or process that installs and requires path-addon-extend versions 1.0.7 or 1.0.8 is vulnerable to arbitrary remote code execution. The malicious code is fetched dynamically from a public JSON-bin service, which can be altered by an attacker to execute arbitrary commands or payloads within the context of the affected process. This can lead to full system compromise depending on the privileges of the running process.

No official patch or remediation is currently available. Users should immediately remove and replace path-addon-extend versions 1.0.7 and 1.0.8 from their projects. Avoid using this package entirely due to its malicious nature. Monitor dependencies carefully and verify package authenticity before installation.