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OpenAdvisories
High USN-4951-1 1 CVE

flatpak vulnerability

Published May 12, 2021 · Updated Apr 22, 2026

Ecosystem: Ubuntu

Summary

Anton Lydike discovered that Flatpak did not properly handle special tokens
in desktop files. An attacker could use this to specially craft a Flatpak
application that could escape sandbox confinement.

Fixed packages 2

ReleasePackageFixed in
Ubuntu · 18.04 LTS 18.04:LTS flatpak 1.0.9-0ubuntu0.3
Ubuntu · 20.04 LTS 20.04:LTS flatpak 1.6.5-0ubuntu0.3

Vulnerabilities 1

  • High 7.1
    CVE-2021-21381

    Sandbox escape via special tokens in .desktop file

    Flatpak is a system for building, distributing, and running sandboxed desktop applications on Linux. In Flatpack since version 0.9.4 and before version 1.10.2 has a vulnerability in the "file forwarding" feature which can be used by an attacker to gain access…

    Flatpak Flatpak flatpak flatpak Debian Ubuntu

References

  • report
    https://ubuntu.com/security/CVE-2021-21381