{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": "cpe:2.3:a:mongodb:python_driver:*:*:*:*:*:mongodb:*:*",
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "4.18.3"
              }
            ],
            "source": "CPE_RANGE"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "5479af6315dea9bd575bb374f72b645dfacbb3c3"
            }
          ],
          "repo": "https://github.com/mongodb/mongo-python-driver",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "mongodb",
    "cwe_ids": [
      "CWE-125"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/106xxx/CVE-2026-106435.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "introduced": "0.10.3"
          },
          {
            "last_affected": "4.18.2"
          }
        ],
        "source": "AFFECTED_FIELD"
      }
    ]
  },
  "details": "The MongoDB Python Driver's binary accelerator can read outside a buffer when an application decodes malformed BSON containing a truncated regular-expression element without a trailing NUL byte. An actor who can supply BSON to the documented decode or decode_all API can cause the application process to terminate when the C extension is loaded. The driver's normal database wire-protocol path does not reach this code.",
  "id": "CVE-2026-106435",
  "modified": "2026-10-17T02:30:21.433782421Z",
  "published": "2026-10-08T20:12:15.074Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://jira.mongodb.org/browse/PYTHON-6110"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/106xxx/CVE-2026-106435.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-106435"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Application denial of service via out-of-bounds read in BSON Regex decoding in MongoDB Python Driver"
}