{"id":"CVE-2022-21682","summary":"flatpak-builder can access files outside the build directory.","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`.","aliases":["GHSA-8ch7-5j3h-g4fx"],"modified":"2026-04-16T04:34:51.873061928Z","published":"2022-01-13T00:00:00Z","related":["ALSA-2022:7458","SUSE-SU-2022:0712-1","openSUSE-SU-2022:0712-1","openSUSE-SU-2024:11755-1","openSUSE-SU-2024:11756-1"],"database_specific":{"cna_assigner":"GitHub_M","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/21xxx/CVE-2022-21682.json","cwe_ids":["CWE-22"]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/21xxx/CVE-2022-21682.json"},{"type":"ADVISORY","url":"https://github.com/flatpak/flatpak/security/advisories/GHSA-8ch7-5j3h-g4fx"},{"type":"ADVISORY","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/APFTBYGJJVJPFVHRXUW5PII5XOAFI4KH/"},{"type":"ADVISORY","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IXKBERLJRYV7KXKGXOLI6IOXVBQNN4DP/"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2022-21682"},{"type":"ADVISORY","url":"https://security.gentoo.org/glsa/202312-12"},{"type":"ADVISORY","url":"https://www.debian.org/security/2022/dsa-5049"},{"type":"FIX","url":"https://github.com/flatpak/flatpak/commit/445bddeee657fdc8d2a0a1f0de12975400d4fc1a"},{"type":"FIX","url":"https://github.com/flatpak/flatpak/commit/4d11f77aa7fd3e64cfa80af89d92567ab9e8e6fa"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/flatpak/flatpak","events":[{"introduced":"bcdc073041e0c93e15aa108b94cb7a39a79dcdf3"},{"fixed":"17cc9937cad5a10fdbb5dbac1febcc98a10b8d0c"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-21682.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N"}]}