{"id":"CVE-2026-106434","aliases":["DEBIAN-CVE-2026-106434","EUVD-2026-95163","UBUNTU-CVE-2026-106434"],"status":"published","title":"Unrecognized payload acceptance in explicit decryption in MongoDB libmongocrypt","description":"The explicit decryption component of MongoDB libmongocrypt can return an unrecognized encrypted payload unchanged instead of returning a decryption error. An actor who can modify stored encrypted fields, such as a database writer, server, or network intermediary, can cause an affected application to process the supplied bytes as decrypted plaintext.","severity":{"version":"4.0","score":5.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00112,"percentile":0.01397,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-354"],"published":"2026-10-08T18:56:43Z","modified":"2026-10-17T12:58:44Z","fixes":[{"ecosystem":"Debian:14","package":"libmongocrypt","fixed_in":["1.20.5-1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"libmongocrypt","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.10.0-1","1.10.1-1","1.11.0-1","1.12.0-1","1.13.0-1","1.13.1-1","1.13.2-1","1.16.0-1","1.17.0-1","1.17.3-1","1.18.1-1","1.18.2-1","1.19.0-1","1.19.1-1","1.20.0-1","1.20.1-1","1.20.2-1","1.20.3-1","1.20.4-1","1.20.5-1","1.7.2-1","1.8.2-1","1.8.4-1","1.9.1-1"]},{"source":"osv","ecosystem":"Debian:13","package":"libmongocrypt","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.13.2-1","1.13.2-1+deb13u1","1.16.0-1","1.17.0-1","1.17.3-1","1.18.1-1","1.18.2-1","1.19.0-1","1.19.1-1","1.20.0-1","1.20.1-1","1.20.2-1","1.20.3-1","1.20.4-1","1.20.5-1"]},{"source":"osv","ecosystem":"Debian:14","package":"libmongocrypt","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.20.5-1"}]}],"versions":["1.13.2-1","1.16.0-1","1.17.0-1","1.17.3-1","1.18.1-1","1.18.2-1","1.19.0-1","1.19.1-1","1.20.0-1","1.20.1-1","1.20.2-1","1.20.3-1","1.20.4-1"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"libmongocrypt","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.2.1-1","1.2.2-1","1.3.0-1","1.3.0-1ubuntu1"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"libmongocrypt","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.7.2-1","1.8.2-1","1.8.4-1","1.8.4-1build2","1.8.4-1build3"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"libmongocrypt","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.17.0-1","1.19.0-1","1.19.1-1","1.20.0-1","1.20.1-1build1","1.20.2-1"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"libmongocrypt","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.13.2-1","1.17.0-1"]}],"products":[{"vendor":"mongodb","product":"libmongocrypt"}],"references":[{"url":"https://jira.mongodb.org/browse/MONGOCRYPT-966","tags":["report"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-106434","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-106434","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-106434","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-106434","title":"Unrecognized payload acceptance in explicit decryption in MongoDB libmongocrypt","description":"The explicit decryption component of MongoDB libmongocrypt can return an unrecognized encrypted payload unchanged instead of returning a decryption error. An actor who can modify stored encrypted fields, such as a database writer, server, or network intermediary, can cause an affected application to process the supplied bytes as decrypted plaintext.","status":"published","published":"2026-10-08T18:56:43.244Z","modified":"2026-10-08T19:30:49.513Z","cvss":[{"version":"4.0","score":5.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","level":"medium","assessor":"cna"},{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-354"],"updated_at":"2026-11-02T14:20:04.156238Z"}],"euvd":[{"id":"EUVD-2026-95163","description":"The explicit decryption component of MongoDB libmongocrypt can return an unrecognized encrypted payload unchanged instead of returning a decryption error. An actor who can modify stored encrypted fields, such as a database writer, server, or network intermediary, can cause an affected application to process the supplied bytes as decrypted plaintext.","status":"published","published":"2026-10-08T18:56:43Z","modified":"2026-10-08T19:30:49Z","cvss":[{"version":"4.0","score":5.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","level":"medium"}],"updated_at":"2026-11-02T17:27:27.72962Z"}],"nvd":[{"id":"CVE-2026-106434","description":"The explicit decryption component of MongoDB libmongocrypt can return an unrecognized encrypted payload unchanged instead of returning a decryption error. An actor who can modify stored encrypted fields, such as a database writer, server, or network intermediary, can cause an affected application to process the supplied bytes as decrypted plaintext.","status":"published","published":"2026-10-08T19:16:59.39Z","modified":"2026-10-08T20:49:23.24Z","cvss":[{"version":"4.0","score":5.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/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","level":"medium","assessor":"secondary"},{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-354"],"updated_at":"2026-11-02T14:12:55.142936Z"}],"osv":[{"id":"DEBIAN-CVE-2026-106434","description":"The explicit decryption component of MongoDB libmongocrypt can return an unrecognized encrypted payload unchanged instead of returning a decryption error. An actor who can modify stored encrypted fields, such as a database writer, server, or network intermediary, can cause an affected application to process the supplied bytes as decrypted plaintext.","status":"published","published":"2026-10-08T19:16:59.39Z","modified":"2026-10-14T06:00:08.069746228Z","cvss":[{"version":"4.0","score":5.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/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","level":"medium"}],"updated_at":"2026-11-02T15:45:49.381767Z"},{"id":"UBUNTU-CVE-2026-106434","description":"The explicit decryption component of MongoDB libmongocrypt can return an unrecognized encrypted payload unchanged instead of returning a decryption error. An actor who can modify stored encrypted fields, such as a database writer, server, or network intermediary, can cause an affected application to process the supplied bytes as decrypted plaintext.","status":"published","published":"2026-10-08T19:16:00Z","modified":"2026-10-17T12:58:44.255563319Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","level":"medium"},{"version":"4.0","score":5.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","level":"medium"}],"updated_at":"2026-11-02T16:55:59.130573Z"}]}}