In 2021, I performed a security audit of The Squid Caching Proxy. Squid is by far the most well known open-source forwarding HTTP proxy, and is used in many contexts, like corporations that want to filter or cache content, companies that claim to provide a “VPN”, hobbyists, and even a few website use Squid as a reverse proxy. There are currently over 2.5 million instances available on the internet.
I’m very sensitive.