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Arch Linux: The AUR malicious packages incident continues to happen
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Debian/Arch official repos fetch software directly from the distro maintainers, while AUR packages can be uploaded by anyone. So theoretically, Debian/Arch repos are considered more secure than AUR packages. Even Flatpaks are also more secure than AUR packages.
How can previously installed AUR packages be compromised, though?
When the upstream URL gets updated with the malicious uploaders new URL. There is no warning shown in the process; the only way to check it is to inspect the PKGBUILD manually.