A flatpak security update has been released for Debian GNU/Linux 11 to address several vulnerabilities in the Flatpak application deployment framework.

DSA 5049-1: flatpak security update

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Debian Security Advisory DSA-5049-1 security@debian.org
  https://www.debian.org/security/ Sebastien Delafond
January 20, 2022   https://www.debian.org/security/faq
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Package : flatpak
CVE ID : CVE-2021-43860 CVE-2022-21682

Several vulnerabilities were discovered in Flatpak, an application
deployment framework for desktop apps.

CVE-2021-43860

Ryan Gonzalez discovered that Flatpak didn't properly validate
that the permissions displayed to the user for an app at install
time match the actual permissions granted to the app at
runtime. Malicious apps could therefore grant themselves
permissions without the consent of the user.

CVE-2022-21682

Flatpak didn't always prevent a malicious flatpak-builder user
from writing to the local filesystem.

For the stable distribution (bullseye), these problems have been fixed
in version 1.10.7-0+deb11u1.

Please note that flatpak-builder also needed an update for
compatibility, and is now at version 1.0.12-1+deb11u1 in bullseye.

We recommend that you upgrade your flatpak and flatpak-builder
packages.

For the detailed security status of flatpak please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/flatpak

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://www.debian.org/security/