It isn't a Rails specific vulnerability. So if you don't run Rails you're actually worse off because you don't get this (tiny) amount of protection. And even

It isn't a Rails specific vulnerability. So if you don't run Rails you're actually worse off because you don't get this (tiny) amount of protection. And even if it were a Rails specific problem, "Don't run Rails to avoid any issue with Rails" is obvious, and is unhelpful to everyone.