{"schemaVersion":3,"id":"CVE-2026-81523","aliases":["UBUNTU-CVE-2026-81523","DEBIAN-CVE-2026-81523"],"status":"published","duplicateOf":null,"title":null,"description":"A missing input-validation issue in MongoDB libmongocrypt's automatic-encryption context setup allows a caller-supplied database identifier to be accepted without sanitization. The resulting impact is limited to incorrect schema selection, which may lead to limited disclosure or modification of information handled by the application.","dates":{"published":"2026-08-27T18:32:24.206Z","modified":"2026-08-28T15:51:12.001Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":4.4,"severity":"medium","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","computed":false,"selection":"backend-summary"},"metrics":[{"version":"4.0","versionLabel":"v4.0","source":"CVE.org","score":2,"severity":"low","vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":4.4,"severity":"medium","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","exploitability":null,"impact":null,"computed":false},{"version":"4.0","versionLabel":"v4.0","source":"OSV · Ubuntu","score":2,"severity":"low","vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N","exploitability":null,"impact":null,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Ubuntu","score":4.4,"severity":"medium","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","exploitability":4.6,"impact":4.2,"computed":true},{"version":"4.0","versionLabel":"v4.0","source":"OSV · Debian","score":2,"severity":"low","vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:N/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","exploitability":null,"impact":null,"computed":true},{"version":"4.0","versionLabel":"v4.0","source":"NVD","score":2,"severity":"low","vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:N/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","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":4.4,"severity":"medium","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00098,"percentile":0.00727,"severity":"low","asOf":"2026-10-20T00:00:00.000Z","change":{"pp":0.026999999999999996,"baselineDate":"2026-09-20T00:00:00.000Z","baselineScore":0.00071},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.00074,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.00074,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.00074,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.00074,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.00071,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00071,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00071,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00071,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00071,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00071,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00098,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00098,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00098,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00098,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00098,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00098,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00098,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00098,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00098,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00098,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00098,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00098,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00098,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00098,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00098,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00098,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00098,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00098,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00098,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00098,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00098,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00098,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00098,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00098,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00098,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00098,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00098,"percentile":0.00727}],"last30":[{"date":"2026-09-20T00:00:00.000Z","score":0.00071,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00071,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00071,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00071,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00098,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00098,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00098,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00098,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00098,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00098,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00098,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00098,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00098,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00098,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00098,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00098,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00098,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00098,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00098,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00098,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00098,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00098,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00098,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00098,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00098,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00098,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00098,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00098,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00098,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00098,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00098,"percentile":0.00727}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-74","name":"Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')","description":"The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component.","type":"weakness","status":"Incomplete","abstraction":"Class","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/74.html"}],"affected":[{"vendor":"debian","product":"libmongocrypt","name":"libmongocrypt","label":"libmongocrypt","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/libmongocrypt","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null},{"text":"< 1.13.2-1+deb13u1","noFixRecorded":false,"fixedIn":null},{"text":"< 1.20.3-1","noFixRecorded":false,"fixedIn":null}],"versionsText":"All versions (No fix recorded) | < 1.13.2-1+deb13u1 | < 1.20.3-1","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"libmongocrypt","name":"libmongocrypt","label":"libmongocrypt","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/libmongocrypt","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"mongodb","product":"libmongocrypt","name":"libmongocrypt","label":"libmongocrypt","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 1.0.0, < 1.20.3","noFixRecorded":false,"fixedIn":null},{"text":"< 1.20.3","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 1.0.0, < 1.20.3 | < 1.20.3","eol":null,"hubHref":"/vendor/mongodb/libmongocrypt"}],"affectedCount":3,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://jira.mongodb.org/browse/MONGOCRYPT-977","label":"jira.mongodb.org/browse/MONGOCRYPT-977","hostname":"jira.mongodb.org","tags":["REPORT","Vendor Advisory","Issue Tracking","Patch"]},{"url":"https://github.com/mongodb/libmongocrypt/releases/tag/1.20.3","label":"github.com/mongodb/libmongocrypt/releases/tag/1.20.3","hostname":"github.com","tags":["REPORT","Product"]},{"url":"https://ubuntu.com/security/CVE-2026-81523","label":"ubuntu.com/security/CVE-2026-81523","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-81523","label":"www.cve.org/CVERecord?id=CVE-2026-81523","hostname":"www.cve.org","tags":["REPORT"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-81523","label":"security-tracker.debian.org/tracker/CVE-2026-81523","hostname":"security-tracker.debian.org","tags":["Advisory"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2026-08-27T18:32:24.206Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-08-28T15:51:12.001Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":18,"level":"low","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-20T23:07:50.907Z","stale":false,"partial":false}}