MongoDB C Driver <1.30.5, 2.0.x: bson_validate Skips Validation Bypass
CVE-2026-6231 Published on April 13, 2026
bson_validate may skip validation when processing certain inputs
The bson_validate function may return early on specific inputs and incorrectly report success. This behavior could result in skipping validation for BSON data, allowing malformed or invalid UTF-8 sequences to bypass validation and be processed incorrectly. The issue may affect applications that rely on these functions to validate untrusted BSON data before further processing. This issue affects MongoDB C Driver versions prior to 1.30.5, MongoDB C Driver version 2.0.0 and MongoDB C Driver version 2.0.1
Vulnerability Analysis
CVE-2026-6231 can be exploited with network access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality, with no impact on integrity, and no impact on availability.
Weakness Type
Improper Input Validation
The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.
Products Associated with CVE-2026-6231
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Affected Versions
MongoDB Inc. C Driver:- Version 1.0 and below 1.30.5 is affected.
- Version 2.0 and below 2.0.2 is affected.