NPM package with 3 million weekly downloads had a severe vulnerability

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Popular NPM package “pac-resolver” has fixed a severe remote code execution (RCE) flaw.

The pac-resolver package receives over 3 million weekly downloads, extending this vulnerability to Node.js applications relying on the open source dependency. Pac-resolver touts itself as a module that accepts JavaScript proxy configuration files and generates a function for your app to map certain domains to use a proxy.

To proxy or not to proxy

This week, developer Tim Perry disclosed a high-severity flaw in pac-resolver that can enable threat actors on the local network to run arbitrary code within your Node.js process whenever it attempts to make an HTTP request.

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