I hope this goes without saying but please do not run this on machines you don’t own.

The good news:

• the exploit seems to require user action

The bad news:

• Device Firewalls are ineffective against this

• if someone created a malicious printer on a local network like a library they could create serious issues

• it is hard to patch without breaking printing

• it is very easy to create printers that look legit

• even if you don’t hit print the cups user agent can reveal lots of information. This may be blocked at the Firewall

TLDR: you should be careful hitting print