{
  "cveId": "CVE-2026-54911",
  "url": "https://patchblox.com/security/cve/CVE-2026-54911",
  "summary": "CVE-2026-54911 is fixed in ujson on 1 platform by DEBIAN-CVE-2026-54911 (version 5.13.0-1), released July 9, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "ujson: UltraJSON is a fast JSON encoder and decoder written in pure C with bindings for Python 3.7\u002B",
  "description": "UltraJSON is a fast JSON encoder and decoder written in pure C with bindings for Python 3.7\u002B. Prior to 5.13.0, ujson.dumps() (or ujson.dump() or ujson.encode()) have a reject_bytes=False option. When set, they may accept malformed or truncated UTF-8 byte sequences, silently rewriting them into different Unicode characters instead of rejecting them. This leads to input validation bypass and data integrity issues. This vulnerability is fixed in 5.13.0.",
  "published": "2026-06-22T22:16:50Z",
  "severity": "medium",
  "cvss": 6.5,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
  "epss": 0.00371,
  "epssPercentile": 0.31303,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "ujson",
      "release": "Debian 14",
      "fixedVersion": "5.13.0-1",
      "fix": "DEBIAN-CVE-2026-54911",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-54911",
      "released": "2026-07-09T15:45:02Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T19:12:23Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}