{
  "cveId": "CVE-2026-3298",
  "url": "https://patchblox.com/security/cve/CVE-2026-3298",
  "summary": "CVE-2026-3298 is fixed in 2 products on 2 platforms, first by Python 3.14 3.14.5, released May 10, 2026. 10 other affected products have no fix yet. It is not reported as exploited. Patch Radar priority: High.",
  "title": "Out-of-bounds write in Windows asyncio.ProacterEventLoop.sock_recvfrom_into() when using nbytes",
  "description": "The method \u0022sock_recvfrom_into()\u0022 of \u0022asyncio.ProacterEventLoop\u0022 (Windows only) was missing a boundary check for the data buffer when using nbytes parameter. This allowed for an out-of-bounds buffer write if data was larger than the buffer size. Non-Windows platforms are not affected.",
  "published": "2026-04-21T15:16:37Z",
  "severity": "Important",
  "cvss": 8.8,
  "cwe": "Out-of-bounds Write",
  "epss": 0.00392,
  "epssPercentile": 0.3358,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-3298",
  "fixes": [
    {
      "platform": "windows-app",
      "product": "Python 3.13",
      "fixedVersion": "3.13.14",
      "fix": "Python 3.13 3.13.14",
      "url": "https://patchblox.com/security/fix/windows-app/python.python.3.13-3.13.14",
      "released": "2026-06-10T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Python 3.14",
      "fixedVersion": "3.14.5",
      "fix": "Python 3.14 3.14.5",
      "url": "https://patchblox.com/security/fix/windows-app/python.python.3.14-3.14.5",
      "released": "2026-05-10T00:00:00Z"
    }
  ],
  "noFixYet": [
    {
      "platform": "Windows apps",
      "product": "Python 2",
      "status": "no-fix",
      "affectedVersion": "2.7.18150"
    },
    {
      "platform": "Windows apps",
      "product": "Python 3.10",
      "status": "no-fix",
      "affectedVersion": "3.10.11"
    },
    {
      "platform": "Windows apps",
      "product": "Python 3.11",
      "status": "no-fix",
      "affectedVersion": "3.11.9"
    },
    {
      "platform": "Windows apps",
      "product": "Python 3.12",
      "status": "no-fix",
      "affectedVersion": "3.12.10"
    },
    {
      "platform": "Windows apps",
      "product": "Python 3.5",
      "status": "no-fix",
      "affectedVersion": "3.5.4"
    },
    {
      "platform": "Windows apps",
      "product": "Python 3.6",
      "status": "no-fix",
      "affectedVersion": "3.6.8"
    },
    {
      "platform": "Windows apps",
      "product": "Python 3.7",
      "status": "no-fix",
      "affectedVersion": "3.7.9"
    },
    {
      "platform": "Windows apps",
      "product": "Python 3.8",
      "status": "no-fix",
      "affectedVersion": "3.8.10"
    },
    {
      "platform": "Windows apps",
      "product": "Python 3.9",
      "status": "no-fix",
      "affectedVersion": "3.9.13"
    },
    {
      "platform": "macOS",
      "product": "Python3",
      "status": "no-fix",
      "affectedVersion": "3.13.13"
    }
  ],
  "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"
  }
}