I noticed the update, released, yesterday, is summarised as "...recommended for all users and improves the security of macOS".
Well yes, I think we'd all agree, the fact that the fix "improves security" cannot be denied.
More seriously, credit to them for getting a fix out same day the story broke. All software has bugs, I wrote and released plenty of bugs in my own software when I worked for a living. I tend to judge software vendors by how quickly they fix the bugs, rather than the fact that bugs exist.