TL;DR there was a backdoor found in the XZ program. All major distros have been updated but it is recommended that you do a fresh install on systems that are exposed to the internet and that had the bad version of the program. Only upstream distros were affected.

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[–] 4 points 2 years ago

The reason openssh links liblzma in the first place is to enable a systemd feature, so naturally "systemd bad, it's proximity to a security issue is yet more proof that a pile of shell scripts in a trenchcoat is a superior init system" etc

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