510
backdoor in upstream xz/liblzma leading to ssh server compromise
(www.openwall.com)
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Archlinux's XZ was compromised as well.
News post
Git change for not using tarballs from source
No, read the link you posted:
I think that was a precaution. The malicious build script ran during the build, but the backdoor itself was most likely not included in the resuling package as it checked for specific packaging systems.
https://www.openwall.com/lists/oss-security/2024/03/29/22