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Chris Williams discovered a flaw in the handling of mounts for
persistent directories in Flatpak, an application deployment framework
for desktop apps. A malicious or compromised Flatpak app using
persistent directories could take advantage of this flaw to access files
outside of the sandbox.
Details can be found in the upstream advisory at
https://github.com/flatpak/flatpak/security/advisories/GHSA-7hgv-f2j8-xw87