xz --version
I understand it's unlikely, but is there anything I can do to check if the backdoor was used? Also any other steps I should take after "brew upgrade"?
>> Looks like that Homebrew users (both macOS and Linux, both Intel and ARM) are unlikely affected?
> Correct. Though we do not appear to be affected, this revert was done out of an abundance of caution.
xz 5.6.1 -> 5.4.6(or SHAs, etc.)
(EDIT: 5.6.0 and 5.6.1 ?)
(EDIT 2: Ooof, looks like the nix unstable channel uses xz 5.6.1 at this time)
I use Nix to manage this stuff on Mac, not Homebrew...