{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": [
              "cpe:2.3:a:mongodb:mongodb:*:*:*:*:*:*:*:*",
              "cpe:2.3:a:mongodb:mongodb:9.0.0:alpha0:*:*:-:-:*:*",
              "cpe:2.3:a:mongodb:mongodb:9.0.0:alpha1:*:*:-:-:*:*",
              "cpe:2.3:a:mongodb:mongodb:9.1.0:alpha0:*:*:-:-:*:*"
            ],
            "extracted_events": [
              {
                "introduced": "7.0.0"
              },
              {
                "fixed": "7.0.40"
              },
              {
                "introduced": "8.0.0"
              },
              {
                "fixed": "8.0.29"
              },
              {
                "introduced": "8.2.0"
              },
              {
                "last_affected": "8.2.12"
              },
              {
                "introduced": "8.3.0"
              },
              {
                "fixed": "8.3.8"
              },
              {
                "introduced": "9.0.0-alpha0"
              },
              {
                "last_affected": "9.0.0-alpha0"
              },
              {
                "introduced": "9.0.0-alpha1"
              },
              {
                "last_affected": "9.0.0-alpha1"
              },
              {
                "introduced": "9.1.0-alpha0"
              },
              {
                "last_affected": "9.1.0-alpha0"
              }
            ],
            "source": [
              "CPE_RANGE",
              "CPE_STRING"
            ]
          },
          "events": [
            {
              "introduced": "37d84072b5c5b9fd723db5fa133fb202ad2317f1"
            },
            {
              "fixed": "d18b92bf3d150c32f129aba9317efb627d3f5ab1"
            },
            {
              "introduced": "b41cda4fe697dce6fd9b83b3805362ccc02fbeb3"
            },
            {
              "fixed": "1cf71c50824f7acb2805f2cfe7bb8c06c74c33b8"
            },
            {
              "introduced": "b993867dce63dd366cd93e60f3f425ed716f6497"
            },
            {
              "last_affected": "10d50f5046de5c76a9d869823219134b3596905a"
            },
            {
              "introduced": "0f29b043a58fdd251ce0a0b32754b8459613c933"
            },
            {
              "fixed": "d100bf19961251f273e1d0bd8ce66fc60634f53c"
            },
            {
              "introduced": "3a33d18cd99f6855f658572fadf4f17ca699a9fe"
            },
            {
              "last_affected": "e78de88ae7504aee707fd083c579c3f54eab50ab"
            }
          ],
          "repo": "https://github.com/mongodb/mongo",
          "type": "GIT"
        }
      ],
      "versions": [
        "9.0.0-alpha0",
        "9.0.0-alpha1",
        "9.1.0-alpha0"
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "mongodb",
    "cwe_ids": [
      "CWE-617"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/18xxx/CVE-2026-18697.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "introduced": "8.3.0"
          },
          {
            "fixed": "8.3.8"
          },
          {
            "introduced": "8.0"
          },
          {
            "fixed": "8.0.29"
          },
          {
            "introduced": "7.0"
          },
          {
            "fixed": "7.0.40"
          }
        ],
        "source": "AFFECTED_FIELD"
      }
    ]
  },
  "details": "An issue in MongoDB Server's aggregation framework could allow an unauthenticated party to cause a mongos (router) process to terminate unexpectedly by submitting a specially formed aggregation command. This could result in a denial of service, disrupting client connections routed through the affected mongos instance.",
  "id": "CVE-2026-18697",
  "modified": "2026-09-18T03:30:22.278024797Z",
  "published": "2026-08-11T18:39:03.905Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://jira.mongodb.org/browse/SERVER-130110"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/18xxx/CVE-2026-18697.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-18697"
    }
  ],
  "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": "Improper Input Validation in MongoDB Aggregation Framework Allows Unauthenticated Denial of Service on mongos"
}