{"id":"CVE-2026-18687","title":"MongoDB Server's handling of a Queryable Encryption maintenance operation did not properly validate certain request parameters against the collection's encrypted field configuration before use","summary":"MongoDB Server's handling of a Queryable Encryption maintenance operation did not properly validate certain request parameters against the collection's encrypted field configuration before use. An authenticated user with readWrite privil…","severity":"high","cvss":7.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H","cwe":["CWE-191"],"vendor":"mongodb","product":"mongodb","affected":["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":"2026-09-16T15:14:07.103","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-18687","references":[{"url":"https://jira.mongodb.org/browse/SERVER-130628","label":"cna@mongodb.com"}],"tags":["nvd"],"epss":0.00234,"epssPercentile":0.12826,"ingestedAt":"2026-08-29T19:41:15.402Z","slug":"CVE-2026-18687","body":"## Overview\n\nMongoDB Server's handling of a Queryable Encryption maintenance operation did not properly validate certain request parameters against the collection's encrypted field configuration before use. An authenticated user with readWrite privileges could submit a specially formed request that leads to a server crash or excessive internal writes, resulting in resource exhaustion and corruption of encrypted index data.\n\n## Affected\n\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":39,"depthScoreParts":{"impact":39.1,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}