524
backdoor in upstream xz/liblzma leading to ssh server compromise
(www.openwall.com)
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Not regular Fedora, though, it was only in Fedora Rawhide and Fedora 41, so very very early, bleeding edge distributions. Nothing that a regular Fedora user would be using.
https://access.redhat.com/security/cve/cve-2024-3094
E: and Fedora 40 beta which some regular users could conceivably be using
https://www.redhat.com/en/blog/urgent-security-alert-fedora-41-and-rawhide-users