Heap memory out of bounds read and crash in C Driver legacy GridFS file reader

{
  "id": "f9e49b6557d1d980a3324eabfe699f406f3c7ee6cc39c7dbd04dff930b66cfaf",
  "url": "https://osv.dev/vulnerability/CVE-2026-9100",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Heap memory out of bounds read and crash in C Driver legacy GridFS file reader",
    "summary": "The MongoDB C Driver's legacy GridFS API accepts malformed file metadata from the database without adequate validation. Crafted documents in a GridFS collection may cause any application that reads those files via the legacy API to either crash (via a division-by-zero) or silently leak process memory contents (via an out-of-bounds read).",
    "evidence": "osv:CVE-2026-9100",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-9100",
      "aliases": [
        "CVE-2026-9100"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/mongodb/mongo-c-driver",
              "type": "GIT",
              "events": [
                {
                  "introduced": "1cb8a16e863cea77a61530b832ed2c7c1dc5c065"
                },
                {
                  "fixed": "57dba9c04991e38124022e0f16c50b87bd9b29a1"
                },
                {
                  "introduced": "67817df0a9ed11b07e457477e6db1384da9421c4"
                },
                {
                  "fixed": "104e2f8337168126848db06b7e15f4c142a7426e"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:mongodb:c_driver:*:*:*:*:*:mongodb:*:*",
                    "range": [
                      {
                        "introduced": "1.10.0"
                      },
                      {
                        "fixed": "1.30.8"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:mongodb:c_driver:*:*:*:*:*:mongodb:*:*",
                    "range": [
                      {
                        "introduced": "2.0.0"
                      },
                      {
                        "fixed": "2.2.4"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-9100.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:21.843324887Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/9xxx/CVE-2026-9100.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-9100",
        "https://jira.mongodb.org/browse/CDRIVER-6281"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-1285"
        ],
        "cna_assigner": "mongodb",
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "1.0"
                  },
                  {
                    "fixed": "1.30.8"
                  },
                  {
                    "introduced": "2.0"
                  },
                  {
                    "fixed": "2.2.4"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StandardRange"
              }
            ]
          }
        ],
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/9xxx/CVE-2026-9100.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-9100",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 488287,
  "published_at": "2026-05-20T15:55:13.154+00:00"
}