{"id":"CVE-2026-18697","title":"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","summary":"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 s…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-617"],"vendor":"mongodb","product":"mongodb","affected":["mongodb >= 7.0.0, < 7.0.40","mongodb >= 8.0.0, < 8.0.29","mongodb >= 8.2.0, <= 8.2.12","mongodb >= 8.3.0, < 8.3.8","mongodb = 9.0.0","mongodb = 9.1.0"],"patched":["mongodb 8.3.8"],"published":"2026-08-11","updated":"2026-09-16","sourceUpdated":"2026-09-16T15:17:42.620","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-18697","references":[{"url":"https://jira.mongodb.org/browse/SERVER-130110","label":"cna@mongodb.com"}],"tags":["nvd"],"epss":0.00331,"epssPercentile":0.26441,"ingestedAt":"2026-08-29T19:41:15.761Z","slug":"CVE-2026-18697","body":"## Overview\n\nAn 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.\n\n## Affected\n\n- `mongodb >= 7.0.0, < 7.0.40`\n- `mongodb >= 8.0.0, < 8.0.29`\n- `mongodb >= 8.2.0, <= 8.2.12`\n- `mongodb >= 8.3.0, < 8.3.8`\n- `mongodb = 9.0.0`\n- `mongodb = 9.1.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `mongodb 8.3.8`","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}