This person keeps banging the drum of agents running on untrusted inputs doing unexpected things. The proof of concept doesn't prove anything and doesn't even have working code. It's not clear why this is classed as a markdown rendering bug when it appears cline is calling out to a remote server with the contents of an env file as parameters in a url.

edit: are you the author? You seem to post a lot from that blog and the blog author's other accounts.