Not a serious one if all the wrench actually gets you is access to the room that contains the box that no known tool can open, which is a closer analogy to what happened.

Again, though, you're taking "all that gets you" as a prior when (abandoning the metaphor) container and VM escapes are routine vulnerabilities. They just weren't the subject of this particular team who wanted to hack on AI. You don't do security analysis by presuming the absence of vulnerabilities!

Modern security is defense in depth. The AI pre-prompting setup was the first layer, and it was escaped. The UID separation inside the container was another, and it was broken. The container would have been next. And hopefully there are network firewalls and egress rules on top of that, etc... And all of those can and have failed in the past.

And an exploit that breaks out of the sandbox is not really anything if it needs root to work... so if a hacker had those two MS wouldn't care about them selling those bugs because both of them are not serious. See, perfect security and it didn't cost them anything.