{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": [
              "cpe:2.3:a:mongodb:mongoid:*:*:*:*:*:*:*:*",
              "cpe:2.3:a:mongodb:mongoid:9.1.0:*:*:*:*:*:*:*"
            ],
            "extracted_events": [
              {
                "introduced": "8.0.0"
              },
              {
                "fixed": "8.0.13"
              },
              {
                "introduced": "8.1.0"
              },
              {
                "fixed": "8.1.13"
              },
              {
                "introduced": "9.0.0"
              },
              {
                "fixed": "9.0.12"
              },
              {
                "introduced": "9.1.0"
              },
              {
                "last_affected": "9.1.0"
              }
            ],
            "source": [
              "CPE_RANGE",
              "CPE_STRING"
            ]
          },
          "events": [
            {
              "introduced": "6e780948d297615520085d0df49dbe270c34430d"
            },
            {
              "fixed": "4775b2a3ced15ba4505a0f03927ada4a9a9a9f74"
            },
            {
              "introduced": "c95c4859ece38f2d42bf9b9984e7791532a17ff7"
            },
            {
              "fixed": "492a97bb60c554219a52fe07db7c161c8849b5ca"
            },
            {
              "introduced": "88f4b1ae86fab094b553a443dc5067493210c384"
            },
            {
              "fixed": "5373073d24abd206a64ab306a0af0b95a084c4f8"
            },
            {
              "introduced": "fc21c4106477474a655e5a4a03d829feb6997b00"
            },
            {
              "last_affected": "fc21c4106477474a655e5a4a03d829feb6997b00"
            }
          ],
          "repo": "https://github.com/mongodb/mongoid",
          "type": "GIT"
        }
      ],
      "versions": [
        "9.1.0"
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "mongodb",
    "cwe_ids": [
      "CWE-1333"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93761.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "introduced": "7.2.0"
          },
          {
            "last_affected": "7.2.6"
          },
          {
            "introduced": "7.3.0"
          },
          {
            "last_affected": "7.3.5"
          },
          {
            "introduced": "7.4.0"
          },
          {
            "last_affected": "7.4.3"
          },
          {
            "introduced": "7.5.0"
          },
          {
            "last_affected": "7.5.4"
          },
          {
            "introduced": "7.6.0"
          },
          {
            "last_affected": "7.6.1"
          },
          {
            "introduced": "8.0.0"
          },
          {
            "last_affected": "8.0.12"
          },
          {
            "introduced": "8.1.0"
          },
          {
            "last_affected": "8.1.12"
          },
          {
            "introduced": "9.0.0"
          },
          {
            "last_affected": "9.0.11"
          },
          {
            "introduced": "9.1.0"
          },
          {
            "last_affected": "9.1.0"
          }
        ],
        "source": "AFFECTED_FIELD"
      }
    ]
  },
  "details": "An inefficient regular expression complexity issue in the in-memory query evaluation component of the Mongoid library may allow an unauthenticated party to cause excessive processing within an embedding application process. Applications that place user-supplied text into a pattern-matching query condition on an embedded association may become unresponsive.",
  "id": "CVE-2026-93761",
  "modified": "2026-09-26T03:30:38.424750417Z",
  "published": "2026-09-18T17:20:34.623Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://jira.mongodb.org/browse/MONGOID-5981"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93761.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-93761"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Denial of service via unbounded regex matching in Mongoid's in-memory query matcher"
}