CVE-2026-6231

Received Received - Intake

Validation Bypass in MongoDB C Driver BSON Processing

Publication date: 2026-04-13

Last updated on: 2026-05-06

Assigner: MongoDB, Inc.

Description

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

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-04-13

Last Modified

2026-05-06

Generated

2026-07-06

AI Q&A

2026-04-13

EPSS Evaluated

2026-07-05

NVD

CVE-2026-6231

EUVD

EUVD-2026-22023

Affected Vendors & Products

Vendor	Product	Version / Range
mongodb	c_driver	to 1.30.5 (exc)
mongodb	c_driver	From 2.0.0 (inc) to 2.0.2 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-20	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.

Attack-Flow Graph

Executive Summary

The vulnerability exists in the bson_validate function of the MongoDB C Driver. This function may return early on certain inputs and incorrectly report that the BSON data is valid. As a result, malformed or invalid UTF-8 sequences can bypass validation and be processed incorrectly.

This issue affects applications that rely on the bson_validate function to check untrusted BSON data before processing it further.

Impact Analysis

Because the bson_validate function may incorrectly validate malformed BSON data, applications using this function might process invalid or malicious data without proper checks.

This can lead to incorrect application behavior, potential data corruption, or security issues due to processing unexpected or malformed input.

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