If you have a recently updated NixOS unstable it has the affected version: $ xz --version xz (XZ Utils) 5.6.1 liblzma 5.6.1 EDIT: I've been inform

If you have a recently updated NixOS unstable it has the affected version: $ xz --version xz (XZ Utils) 5.6.1 liblzma 5.6.1 EDIT: I've been informed on the NixOS matrix that they are 99% sure NixOS isn't affected, based on conversations in #security:nixos.org