{
  "affected": [
    {
      "ecosystem_specific": {},
      "package": {
        "ecosystem": "Alpine:v3.13",
        "name": "flatpak",
        "purl": "pkg:apk/alpine/flatpak?arch=source"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.11.4"
            },
            {
              "fixed": "1.10.1-r0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {},
      "package": {
        "ecosystem": "Alpine:v3.14",
        "name": "flatpak",
        "purl": "pkg:apk/alpine/flatpak?arch=source"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.11.4"
            },
            {
              "fixed": "1.10.1-r0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {},
      "package": {
        "ecosystem": "Alpine:v3.15",
        "name": "flatpak",
        "purl": "pkg:apk/alpine/flatpak?arch=source"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.11.4"
            },
            {
              "fixed": "1.10.1-r0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {},
      "package": {
        "ecosystem": "Alpine:v3.16",
        "name": "flatpak",
        "purl": "pkg:apk/alpine/flatpak?arch=source"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.11.4"
            },
            {
              "fixed": "1.10.1-r0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {},
      "package": {
        "ecosystem": "Alpine:v3.17",
        "name": "flatpak",
        "purl": "pkg:apk/alpine/flatpak?arch=source"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.11.4"
            },
            {
              "fixed": "1.10.1-r0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {},
      "package": {
        "ecosystem": "Alpine:v3.18",
        "name": "flatpak",
        "purl": "pkg:apk/alpine/flatpak?arch=source"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.11.4"
            },
            {
              "fixed": "1.10.1-r0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {},
      "package": {
        "ecosystem": "Alpine:v3.19",
        "name": "flatpak",
        "purl": "pkg:apk/alpine/flatpak?arch=source"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.11.4"
            },
            {
              "fixed": "1.10.1-r0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {},
      "package": {
        "ecosystem": "Alpine:v3.20",
        "name": "flatpak",
        "purl": "pkg:apk/alpine/flatpak?arch=source"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.11.4"
            },
            {
              "fixed": "1.10.1-r0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {},
      "package": {
        "ecosystem": "Alpine:v3.21",
        "name": "flatpak",
        "purl": "pkg:apk/alpine/flatpak?arch=source"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.11.4"
            },
            {
              "fixed": "1.10.1-r0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {},
      "package": {
        "ecosystem": "Alpine:v3.22",
        "name": "flatpak",
        "purl": "pkg:apk/alpine/flatpak?arch=source"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.11.4"
            },
            {
              "fixed": "1.10.1-r0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {},
      "package": {
        "ecosystem": "Alpine:v3.23",
        "name": "flatpak",
        "purl": "pkg:apk/alpine/flatpak?arch=source"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.11.4"
            },
            {
              "fixed": "1.10.1-r0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {},
      "package": {
        "ecosystem": "Alpine:v3.24",
        "name": "flatpak",
        "purl": "pkg:apk/alpine/flatpak?arch=source"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.11.4"
            },
            {
              "fixed": "1.10.1-r0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "Flatpak is a system for building, distributing, and running sandboxed desktop applications on Linux. A bug was discovered in the `flatpak-portal` service that can allow sandboxed applications to execute arbitrary code on the host system (a sandbox escape). This sandbox-escape bug is present in versions from 0.11.4 and before fixed versions 1.8.5 and 1.10.0. The Flatpak portal D-Bus service (`flatpak-portal`, also known by its D-Bus service name `org.freedesktop.portal.Flatpak`) allows apps in a Flatpak sandbox to launch their own subprocesses in a new sandbox instance, either with the same security settings as the caller or with more restrictive security settings. For example, this is used in Flatpak-packaged web browsers such as Chromium to launch subprocesses that will process untrusted web content, and give those subprocesses a more restrictive sandbox than the browser itself. In vulnerable versions, the Flatpak portal service passes caller-specified environment variables to non-sandboxed processes on the host system, and in particular to the `flatpak run` command that is used to launch the new sandbox instance. A malicious or compromised Flatpak app could set environment variables that are trusted by the `flatpak run` command, and use them to execute arbitrary code that is not in a sandbox. As a workaround, this vulnerability can be mitigated by preventing the `flatpak-portal` service from starting, but that mitigation will prevent many Flatpak apps from working correctly. This is fixed in versions 1.8.5 and 1.10.0.",
  "id": "ALPINE-CVE-2021-21261",
  "modified": "2026-11-03T06:17:57.979274415Z",
  "published": "2021-01-14T20:15:12.360Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security.alpinelinux.org/vuln/CVE-2021-21261"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "upstream": [
    "CVE-2021-21261"
  ]
}