Vulnerability from bitnami_vulndb
Published
2026-04-23 08:52
Modified
2026-04-23 09:10
Summary
Out-of-bounds write in Windows asyncio.ProacterEventLoop.sock_recvfrom_into() when using nbytes
Details

The method "sock_recvfrom_into()" of "asyncio.ProacterEventLoop" (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.

To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "Bitnami",
        "name": "python",
        "purl": "pkg:bitnami/python"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.11.0"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "severity": [
        {
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "type": "CVSS_V4"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-3298"
  ],
  "database_specific": {
    "cpes": [
      "cpe:2.3:a:python:python:*:*:*:*:*:*:*:*"
    ],
    "severity": "High"
  },
  "details": "The method \"sock_recvfrom_into()\" of \"asyncio.ProacterEventLoop\" (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.",
  "id": "BIT-python-2026-3298",
  "modified": "2026-04-23T09:10:51.830Z",
  "published": "2026-04-23T08:52:48.858Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/python/cpython/commit/1274766d3c29007ab77245a72abbf8dce2a9db4d"
    },
    {
      "type": "WEB",
      "url": "https://github.com/python/cpython/commit/27522b7d6e6588f03e61099dd858cd5a9314e2f2"
    },
    {
      "type": "WEB",
      "url": "https://github.com/python/cpython/commit/95633d2aad4721e25e4dfd9f43dfb6e1edcbd741"
    },
    {
      "type": "WEB",
      "url": "https://github.com/python/cpython/issues/148808"
    },
    {
      "type": "WEB",
      "url": "https://github.com/python/cpython/pull/148809"
    },
    {
      "type": "WEB",
      "url": "https://mail.python.org/archives/list/security-announce@python.org/thread/KWTPIQBOOOUNQP7UFSLBI437NJDFLA3F/"
    },
    {
      "type": "WEB",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-3298"
    }
  ],
  "schema_version": "1.6.2",
  "summary": "Out-of-bounds write in Windows asyncio.ProacterEventLoop.sock_recvfrom_into() when using nbytes"
}


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