{"id":"CVE-2026-1849","aliases":["BIT-mongodb-2026-1849","EUVD-2026-6757","GHSA-cf58-vmg8-228p","UBUNTU-CVE-2026-1849"],"status":"published","title":"Mongod can run out of stack memory when expressions create deeply nested documents","description":"MongoDB Server may experience an out-of-memory failure while evaluating expressions that produce deeply nested documents. The issue arises in recursive functions because the server does not periodically check the depth of the expression.","severity":{"version":"4.0","score":7.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00326,"percentile":0.25908,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-674"],"published":"2026-02-10T18:52:52Z","modified":"2026-10-28T10:45:56Z","fixes":[{"ecosystem":"Bitnami","package":"mongodb","fixed_in":["7.0.29","8.0.18","8.2.2"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Bitnami","package":"mongodb","ranges":[{"type":"SEMVER","events":[{"introduced":"7.0.0"},{"fixed":"7.0.29"},{"introduced":"8.0.0"},{"fixed":"8.0.18"},{"introduced":"8.2.0"},{"fixed":"8.2.2"}]}]},{"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 inc","product":"mongodb server"},{"vendor":"mongodb, inc.","product":"mongodb server"}],"references":[{"url":"https://jira.mongodb.org/browse/SERVER-102364","tags":["Vendor Advisory","advisory","web","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-1849","tags":["web","advisory"]},{"url":"https://github.com/advisories/GHSA-cf58-vmg8-228p"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/1xxx/CVE-2026-1849.json","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-1849","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-1849","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-1849","title":"Mongod can run out of stack memory when expressions create deeply nested documents","description":"MongoDB Server may experience an out-of-memory failure while evaluating expressions that produce deeply nested documents. The issue arises in recursive functions because the server does not periodically check the depth of the expression.","status":"published","published":"2026-02-10T18:52:52.737Z","modified":"2026-02-10T19:17:02.296Z","cvss":[{"version":"4.0","score":7.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high","assessor":"cna"},{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"cna"}],"cwes":["CWE-674"],"updated_at":"2026-11-02T14:20:01.271368Z"}],"euvd":[{"id":"EUVD-2026-6757","description":"MongoDB Server may experience an out-of-memory failure while evaluating expressions that produce deeply nested documents. The issue arises in recursive functions because the server does not periodically check the depth of the expression.","status":"published","published":"2026-02-10T18:52:52Z","modified":"2026-02-10T19:17:02Z","cvss":[{"version":"4.0","score":7.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high"}],"updated_at":"2026-11-02T19:48:41.699812Z"}],"ghsa":[{"id":"GHSA-cf58-vmg8-228p","title":"MongoDB Server may experience an out-of-memory failure while evaluating expressions that produce...","description":"MongoDB Server may experience an out-of-memory failure while evaluating expressions that produce deeply nested documents. 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The issue arises in recursive functions because the server does not periodically check the depth of the expression.","status":"published","published":"2026-02-10T19:15:51.477Z","modified":"2026-06-17T10:16:36.707Z","cvss":[{"version":"4.0","score":7.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/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":"high","assessor":"secondary"},{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"secondary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary"}],"cwes":["CWE-674"],"updated_at":"2026-11-02T14:12:05.908608Z"}],"osv":[{"id":"CVE-2026-1849","title":"Mongod can run out of stack memory when expressions create deeply nested documents","description":"MongoDB Server may experience an out-of-memory failure while evaluating expressions that produce deeply nested documents. The issue arises in recursive functions because the server does not periodically check the depth of the expression.","status":"published","published":"2026-02-10T18:52:52.737Z","modified":"2026-10-28T10:45:56.754046396Z","cvss":[{"version":"4.0","score":7.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high"}],"cwes":["CWE-674"],"updated_at":"2026-11-02T15:44:58.024074Z"},{"id":"UBUNTU-CVE-2026-1849","description":"MongoDB Server may experience an out-of-memory failure while evaluating expressions that produce deeply nested documents. The issue arises in recursive functions because the server does not periodically check the depth of the expression.","status":"published","published":"2026-02-10T19:15:00Z","modified":"2026-04-13T12:44:52.935069Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"},{"version":"4.0","score":7.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high"}],"updated_at":"2026-11-02T16:56:01.334185Z"},{"id":"BIT-mongodb-2026-1849","title":"Mongod can run out of stack memory when expressions create deeply nested documents","description":"MongoDB Server may experience an out-of-memory failure while evaluating expressions that produce deeply nested documents. The issue arises in recursive functions because the server does not periodically check the depth of the expression.","status":"published","published":"2026-02-26T08:47:41.788Z","modified":"2026-09-08T08:48:14.372269937Z","updated_at":"2026-11-02T15:28:33.469426Z"}]}}