Improper State Management in MongoDB libmongocrypt
CVE-2026-106433

8.7HIGH

Key Information:

Vendor

Mongodb
Status
LIBMongocrypt
Vendor
CVE Published:
8 October 2026

What is CVE-2026-106433?

Improper state management within the MongoDB libmongocrypt can result in provider-specific data being misinterpreted when handling key documents that possess duplicate masterKey fields. An authenticated user with permissions to modify key vault documents, or a server providing such documents, can exploit this vulnerability, leading to invalid memory access and improper memory frees. Consequently, this could lead to application crashes or memory corruption within the client process.

Affected Version(s)

libmongocrypt 1.1.0 < 1.20.5

References

https://jira.mongodb.org/browse/MONGOCRYPT-964

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.