I see that it can be slower because of having all the dependencies included with the flatpak itself instead of relying solely on whats installed on the system. I read that this means it isolates or sandboxes itself from the rest of the system.
Does this not mean that it can’t infect the rest of the system even if it had malware?
I have seen people say that it isnt good for security because sometimes they force you to use a specific version of certain dependencies that often times are outdated but I’m wondering why that would matter if it was truly sandboxed and isolated.
Do they mean that installing flatpak itself is a security risk or that also specific flatpaks can be security risks themselves?
In short: No. It’s getting better, but Flatpak is by no means secure. Think of it as a Windows .exe or .msi with some (not that hardened) rights management.
In addition, Flatpaks afe often community made and not even “signed” (which is not really a thing in Flatpak to begin with (yet) ((afaik))).
Something really secure would be a container, something really, really secure would be a VM, something really, really, really secure would be a separate machine. Flatpak is less secure than the least secure thing in this enumeration.
I don’t think they have bad security. It should be impossible to actually break with the sandbox with the currently known information. The vulnerability I could see is human related. The sandbox can’t help you if you give it your login information.