{"id":"UBUNTU-CVE-2022-21682","details":"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`.","modified":"2026-09-10T16:30:19.765779378Z","published":"2022-01-13T21:15:00Z","upstream":["CVE-2022-21682"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2022-21682"},{"type":"REPORT","url":"https://github.com/flatpak/flatpak/security/advisories/GHSA-8ch7-5j3h-g4fx"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2022-21682"}],"affected":[{"package":{"name":"flatpak","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/flatpak?arch=source&distro=esm-apps%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.8.7-5","0.10.0-1","0.10.0-2","0.10.1-1","0.10.2-1","0.10.2.1-1","0.10.2.1-2","0.10.3-1","0.11.1-0ubuntu1","0.11.3-2","0.11.3-3","0.11.7-0ubuntu0.1","1.0.1-0ubuntu0.1","1.0.6-0ubuntu0.1","1.0.7-0ubuntu0.18.04.1","1.0.8-0ubuntu0.18.04.1","1.0.9-0ubuntu0.1","1.0.9-0ubuntu0.2","1.0.9-0ubuntu0.3","1.0.9-0ubuntu0.4","1.0.9-0ubuntu0.4+esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"flatpak","binary_version":"1.0.9-0ubuntu0.4+esm1"},{"binary_version":"1.0.9-0ubuntu0.4+esm1","binary_name":"flatpak-tests"},{"binary_name":"gir1.2-flatpak-1.0","binary_version":"1.0.9-0ubuntu0.4+esm1"},{"binary_name":"libflatpak0","binary_version":"1.0.9-0ubuntu0.4+esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2022/UBUNTU-CVE-2022-21682.json"}},{"package":{"name":"flatpak","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/flatpak?arch=source&distro=esm-apps%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.4.3-1","1.6.0-1","1.6.1-1","1.6.2-1","1.6.3-1","1.6.5-0ubuntu0.1","1.6.5-0ubuntu0.2","1.6.5-0ubuntu0.3","1.6.5-0ubuntu0.4","1.6.5-0ubuntu0.5","1.6.5-0ubuntu0.5+esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"flatpak","binary_version":"1.6.5-0ubuntu0.5+esm1"},{"binary_name":"flatpak-tests","binary_version":"1.6.5-0ubuntu0.5+esm1"},{"binary_name":"gir1.2-flatpak-1.0","binary_version":"1.6.5-0ubuntu0.5+esm1"},{"binary_name":"libflatpak0","binary_version":"1.6.5-0ubuntu0.5+esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2022/UBUNTU-CVE-2022-21682.json"}},{"package":{"name":"flatpak","ecosystem":"Ubuntu:Pro:22.04:LTS","purl":"pkg:deb/ubuntu/flatpak?arch=source&distro=esm-apps%2Fjammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.10.2-3","1.12.2-1","1.12.2-2","1.12.3-1","1.12.4-1","1.12.5-1","1.12.6-1","1.12.7-1","1.12.7-1ubuntu0.1","1.12.7-1ubuntu0.1+esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"flatpak","binary_version":"1.12.7-1ubuntu0.1+esm1"},{"binary_name":"flatpak-tests","binary_version":"1.12.7-1ubuntu0.1+esm1"},{"binary_version":"1.12.7-1ubuntu0.1+esm1","binary_name":"gir1.2-flatpak-1.0"},{"binary_name":"libflatpak0","binary_version":"1.12.7-1ubuntu0.1+esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2022/UBUNTU-CVE-2022-21682.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N"},{"type":"Ubuntu","score":"low"}]}