How to get people using a leaked build to stop using that build?

A member of another team told me that there was a leaked build that had a really bad bug in it. I forget exactly what the problem was, but the details aren't important. The team fixed the bug as soon as it was discovered, and they notified all the self-hosters and partners to upgrade to a new build immediately, but that bug was also out there in the leaked builds, ready to destroy computers and networks and most of Western civilization.So how do you get people who are running a leaked build to stop running that build, with urgency?Great story.