{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": "cpe:2.3:a:mongodb:c_driver:*:*:*:*:*:mongodb:*:*",
            "extracted_events": [
              {
                "introduced": "1.10.0"
              },
              {
                "fixed": "1.30.11"
              },
              {
                "introduced": "2.2.0"
              },
              {
                "fixed": "2.5.4"
              }
            ],
            "source": "CPE_RANGE"
          },
          "events": [
            {
              "introduced": "1cb8a16e863cea77a61530b832ed2c7c1dc5c065"
            },
            {
              "fixed": "c3febede70c3b8955905f4de519326069e80483c"
            },
            {
              "introduced": "9ad750264dbdf6eb23efa6859b7488a8275ae693"
            },
            {
              "fixed": "ad87ab88907a0105823469fb5d393ed717bed9ba"
            }
          ],
          "repo": "https://github.com/mongodb/mongo-c-driver",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "mongodb",
    "cwe_ids": [
      "CWE-787"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93393.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "introduced": "2.3.0"
          },
          {
            "last_affected": "2.3.3"
          },
          {
            "introduced": "2.2.0"
          },
          {
            "last_affected": "2.2.4"
          },
          {
            "introduced": "2.1.0"
          },
          {
            "last_affected": "2.1.2"
          },
          {
            "introduced": "2.0.0"
          },
          {
            "last_affected": "2.0.2"
          },
          {
            "introduced": "1.30.0"
          },
          {
            "last_affected": "1.30.8"
          },
          {
            "introduced": "1.29.0"
          },
          {
            "last_affected": "1.29.2"
          },
          {
            "introduced": "1.28.0"
          },
          {
            "last_affected": "1.28.1"
          },
          {
            "introduced": "1.27.0"
          },
          {
            "last_affected": "1.27.6"
          },
          {
            "introduced": "1.26.0"
          },
          {
            "last_affected": "1.26.2"
          },
          {
            "introduced": "1.25.0"
          },
          {
            "last_affected": "1.25.4"
          },
          {
            "introduced": "1.24.0"
          },
          {
            "last_affected": "1.24.4"
          },
          {
            "introduced": "2.4.0"
          },
          {
            "last_affected": "2.4.0"
          }
        ],
        "source": "AFFECTED_FIELD"
      }
    ]
  },
  "details": "A heap-based buffer overflow exists in the TLS transport layer of the MongoDB C Driver when built with the Windows platform TLS backend. A remote endpoint that the client connects to can cause the driver to write uncontrolled data outside the bounds of a heap allocation while processing incoming encrypted traffic after the TLS handshake completes. No authentication or user interaction is required, because the affected processing occurs before any application-level authentication completes. Triggering this issue may lead to memory corruption in the client process, disclosure of adjacent heap memory, or termination of the process.",
  "id": "CVE-2026-93393",
  "modified": "2026-10-08T02:31:01.352594537Z",
  "published": "2026-09-17T20:26:38.911Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://jira.mongodb.org/browse/CDRIVER-6417"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93393.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-93393"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Heap overflow via oversized decrypted TLS record sequence in Windows Secure Channel stream"
}