{"id":"CVE-2026-18706","title":"An issue in MongoDB Server's $graphLookup aggregation stage could allow an authenticated user able to issue aggregation and memory-management commands to cause an internal reference to be used after the underlying memory has been freed","summary":"An issue in MongoDB Server's $graphLookup aggregation stage could allow an authenticated user able to issue aggregation and memory-management commands to cause an internal reference to be used after the underlying memory has been freed. …","severity":"medium","cvss":6.6,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-416"],"vendor":"mongodb","product":"mongodb","affected":["mongodb >= 8.3.0, < 8.3.8","mongodb = 9.0.0"],"patched":["mongodb 8.3.8"],"published":"2026-08-11","updated":"2026-09-16","sourceUpdated":"2026-09-16T15:19:25.793","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-18706","references":[{"url":"https://jira.mongodb.org/browse/SERVER-128551","label":"cna@mongodb.com"}],"tags":["nvd"],"epss":0.0034,"epssPercentile":0.27454,"ingestedAt":"2026-08-29T19:41:16.119Z","slug":"CVE-2026-18706","body":"## Overview\n\nAn issue in MongoDB Server's $graphLookup aggregation stage could allow an authenticated user able to issue aggregation and memory-management commands to cause an internal reference to be used after the underlying memory has been freed. This could result in a server crash or, potentially, execution of unintended code.\n\n## Affected\n\n- `mongodb >= 8.3.0, < 8.3.8`\n- `mongodb = 9.0.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `mongodb 8.3.8`","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":36.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}