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Date: Thu, 21 Jan 2021 19:13:13 +0000
From: Simon McVittie <>
Subject: CVE-2021-21261: Flatpak sandbox escape via spawn portal (aka

Affected versions: flatpak >= 0.11.4
Fixed versions: flatpak >= 1.10.0, and 1.8.x >= 1.8.5

Flatpak is a system for building, distributing, and running sandboxed
desktop applications on Linux.

I discovered a bug in the flatpak-portal service that can allow sandboxed
applications to execute arbitrary code on the host system (a sandbox
escape). This is fixed in 1.10.0 and 1.8.5.

The initial fixed versions introduced a regression for users of
'flatpak build' on systems where a setuid version of bubblewrap (bwrap)
is required. Version 1.10.1 additionally resolves the regression. The
regression fix has been backported to the flatpak-1.8.x branch but is
not currently in any 1.8.x release.

More details:

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