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.
Published: 2026-10-08
Score: 8.7 High
EPSS: n/a
KEV: No
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History

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'}


Subscriptions

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cve-icon MITRE

Status: PUBLISHED

Assigner: mongodb

Published:

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

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

Link: CVE-2026-106433

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

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

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

Link: CVE-2026-106433

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses
  • CWE-843

    Access of Resource Using Incompatible Type ('Type Confusion')