{
  "cveId": "CVE-2022-39254",
  "url": "https://patchblox.com/security/cve/CVE-2022-39254",
  "summary": "CVE-2022-39254 is fixed in python-matrix-nio on 1 platform, first by DEBIAN-CVE-2022-39254, released September 29, 2022. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "python-matrix-nio: matrix-nio is a Python Matrix client library, designed according to sans I/O principles",
  "description": "matrix-nio is a Python Matrix client library, designed according to sans I/O principles. Prior to version 0.20, when a users requests a room key from their devices, the software correctly remember the request. Once they receive a forwarded room key, they accept it without checking who the room key came from. This allows homeservers to try to insert room keys of questionable validity, potentially mounting an impersonation attack. Version 0.20 fixes the issue.",
  "published": "2022-09-29T15:15:10Z",
  "severity": "medium",
  "cvss": 6.5,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N",
  "epss": 0.00678,
  "epssPercentile": 0.52563,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "python-matrix-nio",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "0.20.0-1",
      "fix": "DEBIAN-CVE-2022-39254",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2022-39254",
      "released": "2022-09-29T15:15:10Z"
    },
    {
      "platform": "linux",
      "product": "python-matrix-nio",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "0.20.0-1",
      "fix": "DEBIAN-CVE-2022-39254",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2022-39254",
      "released": "2022-09-29T15:15:10Z"
    },
    {
      "platform": "linux",
      "product": "python-matrix-nio",
      "release": "Debian 14",
      "fixedVersion": "0.20.0-1",
      "fix": "DEBIAN-CVE-2022-39254",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2022-39254",
      "released": "2022-09-29T15:15:10Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}