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I have a question about flatpak
(lemm.ee)
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this post was submitted on 23 Oct 2024
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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.
Flatpaks are containers. They do have a lot of holes though.
They have there own tradeoffs. The weakness is usually the user.