Flatpak is a system for building, distributing, and running sandboxed desktop applications on Linux

{
  "id": "1d82d6354dfc4d81da31b76df7487ac05074b68de230fd2f13a4421b973bd8b1",
  "url": "https://osv.dev/vulnerability/CLEANSTART-2024-PO02295",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Flatpak is a system for building, distributing, and running sandboxed desktop applications on Linux",
    "summary": "Security vulnerability affects the flatpak package. Flatpak is a system for building, distributing, and running sandboxed desktop applications on Linux.",
    "evidence": "osv:CLEANSTART-2024-PO02295",
    "products": [
      {
        "name": {
          "value": "flatpak",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "1.10.1-r0",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CLEANSTART-2024-PO02295",
      "aliases": [
        "CLEANSTART-2024-PO02295"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1.10.1-r0"
                }
              ]
            }
          ],
          "package": {
            "name": "flatpak",
            "purl": "pkg:apk/cleanstart/flatpak",
            "ecosystem": "CleanStart"
          },
          "database_specific": {
            "source": "https://github.com/cleanstart-dev/cleanstart-security-advisories/blob/main/advisories/2024/CLEANSTART-2024-PO02295.json"
          }
        }
      ],
      "modified": "2026-10-08T16:47:26.241426791Z",
      "provider": "osv",
      "upstream": [
        "CVE-2021-21261"
      ],
      "references": [
        "https://github.com/cleanstart-dev/cleanstart-security-advisories/tree/main/advisories/2024/CLEANSTART-2024-PO02295.json",
        "https://osv.dev/vulnerability/CVE-2021-21261",
        "https://nvd.nist.gov/vuln/detail/CVE-2021-21261"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-21261",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 102955,
  "published_at": "2026-10-01T08:09:27.04+00:00"
}