CVE-2026-18503 Super-linear CPU usage for unbounded input to csv.Sniffer.sniff()

[
  {
    "defaultStatus": "unaffected",
    "modules": [
      "csv"
    ],
    "product": "CPython",
    "repo": "https://github.com/python/cpython",
    "vendor": "Python Software Foundation",
    "versions": [
      {
        "version": "0",
        "lessThan": "3.13.15",
        "status": "affected",
        "versionType": "python"
      },
      {
        "version": "3.14.0",
        "lessThan": "3.14.7",
        "status": "affected",
        "versionType": "python"
      },
      {
        "version": "3.15.0a1",
        "lessThan": "3.15.0rc1",
        "status": "affected",
        "versionType": "python"
      }
    ]
  }
]