Do older versions of Nova have any security flaws which preclude using them?

I've been using this app for ages and it's been essentially feature-complete for several years. A part of me wants to switch launchers for no other reason than "it is supported and not tracking me", but it is possible for software to be finished, and I believe Nova falls into that category. If there's no meaningful vulnerabilities in it, there's really no reason for me to switch away, at least not immediately.