{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "bcdc073041e0c93e15aa108b94cb7a39a79dcdf3"
            },
            {
              "fixed": "17cc9937cad5a10fdbb5dbac1febcc98a10b8d0c"
            }
          ],
          "repo": "https://github.com/flatpak/flatpak",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-8ch7-5j3h-g4fx"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-22"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/21xxx/CVE-2022-21682.json"
  },
  "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`.",
  "id": "CVE-2022-21682",
  "modified": "2026-04-01T23:09:06.551324304Z",
  "published": "2022-01-13T00:00:00Z",
  "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"
    }
  ],
  "schema_version": "1.7.3",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "flatpak-builder can access files outside the build directory."
}