{"id":"CVE-2026-18709","title":"An issue in MongoDB Server could allow an authenticated user with direct network access to a shard to improperly commit or abort an in-progress prepared transaction, bypassing the intended transaction coordination process","summary":"An issue in MongoDB Server could allow an authenticated user with direct network access to a shard to improperly commit or abort an in-progress prepared transaction, bypassing the intended transaction coordination process. This could res…","severity":"medium","cvss":6.4,"cvssVector":"CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:H","cwe":["CWE-862"],"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":"2026-09-16T15:19:45.197","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-18709","references":[{"url":"https://jira.mongodb.org/browse/SERVER-130544","label":"cna@mongodb.com"}],"tags":["nvd"],"epss":0.00131,"epssPercentile":0.03096,"ingestedAt":"2026-08-29T19:41:16.244Z","slug":"CVE-2026-18709","body":"## Overview\n\nAn issue in MongoDB Server could allow an authenticated user with direct network access to a shard to improperly commit or abort an in-progress prepared transaction, bypassing the intended transaction coordination process. This could result in cross-shard data inconsistency, cluster clock corruption, and violation of transaction atomicity guarantees.\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":"sunlit","depthScore":35,"depthScoreParts":{"impact":35.2,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}