The xz package that has already entered the current F40 pre-release versions/variants and rawhide contains malicious code. This does NOT affect users of the Fedora releases (F38, F39 are thus not affected), but all users who use already F40 pre-release versions/variants or rawhide shall read this: ...
Damn, I had a malicious version installed on my Arch machine. I've since done a system update which removes the backdoor, but looking more into it, it does seem that only fedora and debian(?) are affected/targeted but better safe than sorry.