Directory Traversal Affecting flatpak-builder package, versions <1.2.2-r0


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
1.68% (75th percentile)

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  • Snyk IDSNYK-ALPINE324-FLATPAKBUILDER-17299889
  • published11 Jun 2026
  • disclosed13 Jan 2022

Introduced: 13 Jan 2022

CVE-2022-21682  (opens in a new tab)
CWE-22  (opens in a new tab)

How to fix?

Upgrade Alpine:3.24 flatpak-builder to version 1.2.2-r0 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream flatpak-builder package and not the flatpak-builder package as distributed by Alpine. See How to fix? for Alpine:3.24 relevant fixed versions and status.

Flatpak is a Linux application sandboxing and distribution framework. A path traversal vulnerability affects versions of Flatpak prior to 1.12.3 and 1.10.6. flatpak-builder applies finish-args last in the build. At this point the build directory will have the full access that is specified in the manifest, so running flatpak build against it will gain those permissions. Normally this will not be done, so this is not problem. However, if --mirror-screenshots-url is specified, then flatpak-builder will launch flatpak build --nofilesystem=host appstream-utils mirror-screenshots after finalization, which can lead to issues even with the --nofilesystem=host protection. In normal use, the only issue is that these empty directories can be created wherever the user has write permissions. However, a malicious application could replace the appstream-util binary and potentially do something more hostile. This has been resolved in Flatpak 1.12.3 and 1.10.6 by changing the behaviour of --nofilesystem=home and --nofilesystem=host.

CVSS Base Scores

version 3.1