{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": "cpe:2.3:a:mongodb:c_driver:*:*:*:*:*:mongodb:*:*",
            "extracted_events": [
              {
                "introduced": "1.10.0"
              },
              {
                "fixed": "1.30.10"
              },
              {
                "introduced": "2.2.0"
              },
              {
                "fixed": "2.5.3"
              }
            ],
            "source": "CPE_RANGE"
          },
          "events": [
            {
              "introduced": "1cb8a16e863cea77a61530b832ed2c7c1dc5c065"
            },
            {
              "fixed": "60ce849d4e33d55963ac130b1542fe136bc0a908"
            },
            {
              "introduced": "9ad750264dbdf6eb23efa6859b7488a8275ae693"
            },
            {
              "fixed": "8b93d5956fe5b260ce73dc9269dcdeac7cf84011"
            }
          ],
          "repo": "https://github.com/mongodb/mongo-c-driver",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "mongodb",
    "cwe_ids": [
      "CWE-190"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/88xxx/CVE-2026-88035.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "introduced": "2.2.0"
          },
          {
            "fixed": "2.5.3"
          }
        ],
        "source": "AFFECTED_FIELD"
      }
    ]
  },
  "details": "A size check in the client-side authentication path of the MongoDB C Driver can wrap around, so an unusually large user-name value is accepted and copied past the end of a small buffer. A party able to set the driver's connection settings may cause the application that embeds the driver to terminate unexpectedly. Reaching this code requires a build in which the optional external SASL authentication backend is present and a connection configured to use it.",
  "id": "CVE-2026-88035",
  "modified": "2026-09-18T03:30:17.337924562Z",
  "published": "2026-09-10T18:07:10.823Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://jira.mongodb.org/browse/CDRIVER-6416"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/88xxx/CVE-2026-88035.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-88035"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Heap buffer overflow via wrapped size check during SASL username canonicalization in MongoDB C Driver"
}