Improper state management in MongoDB libmongocrypt can cause provider-specific data to be treated as an incompatible type when cleaning up a key document containing duplicate masterKey fields. An authenticated actor who can modify key vault documents, or a server that returns such a key document, can cause invalid memory access and invalid frees in the client process. This can terminate the application or corrupt process memory.
History

Tue, 27 Oct 2026 20:30:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:a:mongodb:libmongocrypt:*:*:*:*:*:*:*:*

Thu, 08 Oct 2026 20:45:00 +0000

Type Values Removed Values Added
First Time appeared Mongodb
Mongodb libmongocrypt
Vendors & Products Mongodb
Mongodb libmongocrypt

Thu, 08 Oct 2026 20:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Thu, 08 Oct 2026 19:15:00 +0000

Type Values Removed Values Added
Description Improper state management in MongoDB libmongocrypt can cause provider-specific data to be treated as an incompatible type when cleaning up a key document containing duplicate masterKey fields. An authenticated actor who can modify key vault documents, or a server that returns such a key document, can cause invalid memory access and invalid frees in the client process. This can terminate the application or corrupt process memory.
Title Heap corruption via duplicate masterKey fields in MongoDB libmongocrypt
Weaknesses CWE-843
References
Metrics cvssV3_1

{'score': 8.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 8.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: mongodb

Published: 2026-10-08T18:55:34.174Z

Updated: 2026-10-08T19:30:26.703Z

Reserved: 2026-10-06T16:40:35.016Z

Link: CVE-2026-106433

cve-icon Vulnrichment

Updated: 2026-10-08T19:30:22.387Z

cve-icon NVD

Status : Analyzed

Published: 2026-10-08T19:16:59.233

Modified: 2026-10-27T20:17:30.410

Link: CVE-2026-106433

cve-icon Redhat

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