{"id":"CVE-2026-18709","aliases":["BIT-mongodb-2026-18709","EUVD-2026-56883","GHSA-g2m8-vcxw-5h4c","UBUNTU-CVE-2026-18709"],"status":"published","title":"Missing Authorization in MongoDB Sharded Transaction Commit/Abort Handling Leads to Cross-Shard Data Inconsistency","description":"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 result in cross-shard data inconsistency, cluster clock corruption, and violation of transaction atomicity guarantees.","severity":{"version":"4.0","score":5.9,"vector":"CVSS:4.0/AV:A/AC:H/AT:P/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00195,"percentile":0.09316,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-862"],"published":"2026-08-11T18:48:11Z","modified":"2026-10-28T11:07:55Z","fixes":[{"ecosystem":"Bitnami","package":"mongodb","fixed_in":["7.0.40","8.0.29","8.3.8","9.0.2"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Bitnami","package":"mongodb","ranges":[{"type":"SEMVER","events":[{"introduced":"7.0.0"},{"fixed":"7.0.40"},{"introduced":"8.0.0"},{"fixed":"8.0.29"},{"introduced":"8.2.0"},{"fixed":"8.3.8"},{"introduced":"9.0.0"},{"fixed":"9.0.2"}]}]},{"source":"osv","ecosystem":"Ubuntu:Pro:14.04:LTS","package":"mongodb","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:2.4.6-0ubuntu5","1:2.4.6-0ubuntu6","1:2.4.8-1ubuntu1","1:2.4.8-2","1:2.4.9-1","1:2.4.9-1ubuntu1","1:2.4.9-1ubuntu2","1:2.4.9-1ubuntu2+esm2"]},{"source":"osv","ecosystem":"Ubuntu:Pro:16.04:LTS","package":"mongodb","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:2.6.10-0ubuntu1","1:2.6.10-0ubuntu1+esm2"]},{"source":"osv","ecosystem":"Ubuntu:Pro:18.04:LTS","package":"mongodb","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:3.4.7-1","1:3.4.7-1ubuntu1","1:3.4.7-1ubuntu2","1:3.4.7-1ubuntu4","1:3.4.14-3ubuntu1","1:3.4.14-3ubuntu2","1:3.6.3-0ubuntu1","1:3.6.3-0ubuntu1.1","1:3.6.3-0ubuntu1.3","1:3.6.3-0ubuntu1.4","1:3.6.3-0ubuntu1.4+esm1","1:3.6.3-0ubuntu1.4+esm2"]},{"source":"osv","ecosystem":"Ubuntu:Pro:20.04:LTS","package":"mongodb","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:3.6.9+really3.6.8+90~g8e540c0b6d-0ubuntu2","1:3.6.9+really3.6.8+90~g8e540c0b6d-0ubuntu5","1:3.6.9+really3.6.8+90~g8e540c0b6d-0ubuntu5.2","1:3.6.9+really3.6.8+90~g8e540c0b6d-0ubuntu5.3","1:3.6.9+really3.6.8+90~g8e540c0b6d-0ubuntu5.3+esm1"]}],"products":[{"vendor":"mongodb","product":"mongodb"},{"vendor":"mongodb","product":"mongodb server"},{"vendor":"mongodb, inc.","product":"mongodb server"}],"references":[{"url":"https://jira.mongodb.org/browse/SERVER-130544","tags":["Vendor Advisory","Issue Tracking","advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-18709","tags":["web","advisory"]},{"url":"https://github.com/advisories/GHSA-g2m8-vcxw-5h4c"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/18xxx/CVE-2026-18709.json","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-18709","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-18709","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-18709","title":"Missing Authorization in MongoDB Sharded Transaction Commit/Abort Handling Leads to Cross-Shard Data Inconsistency","description":"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. 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This could result in cross-shard data inconsistency, cluster clock corruption, and violation of transaction atomicity guarantees.","status":"published","published":"2026-08-11T19:17:25.827Z","modified":"2026-10-23T21:10:00.157Z","cvss":[{"version":"4.0","score":5.9,"vector":"CVSS:4.0/AV:A/AC:H/AT:P/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"medium","assessor":"secondary"},{"version":"3.1","score":6.4,"vector":"CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:H","level":"medium","assessor":"secondary"}],"cwes":["CWE-862"],"updated_at":"2026-11-02T14:12:36.880938Z"}],"osv":[{"id":"CVE-2026-18709","title":"Missing Authorization in MongoDB Sharded Transaction Commit/Abort Handling Leads to Cross-Shard Data Inconsistency","description":"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 result in cross-shard data inconsistency, cluster clock corruption, and violation of transaction atomicity guarantees.","status":"published","published":"2026-08-11T18:48:11.583Z","modified":"2026-10-28T11:07:55.295570786Z","cvss":[{"version":"4.0","score":5.9,"vector":"CVSS:4.0/AV:A/AC:H/AT:P/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N","level":"medium"}],"cwes":["CWE-862"],"updated_at":"2026-11-02T15:44:58.024074Z"},{"id":"UBUNTU-CVE-2026-18709","description":"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. 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This could result in cross-shard data inconsistency, cluster clock corruption, and violation of transaction atomicity guarantees.","status":"published","published":"2026-09-17T11:50:15.944Z","modified":"2026-10-01T10:00:08.885158794Z","updated_at":"2026-11-02T15:28:33.469426Z"}]}}