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CVE-2026-6231— bson_validate may skip validation when processing certain inputs

Quick assessment

Affected
MongoDB Inc. C Driver
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

MongoDB C Driver是MongoDB开源的一个用于在C语言程序中连接和操作MongoDB数据库的客户端驱动库。 MongoDB C Driver 1.30.5之前版本、2.0.0版本和2.0.1版本存在安全漏洞，该漏洞源于bson_validate函数可能提前返回并错误报告成功，导致跳过BSON数据验证，可能允许处理格式错误或无效的UTF-8序列。

CVSS 4.3 · Medium EPSS 0.18% · P8

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-6231

Vulnerability Information
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Vulnerability Title
bson_validate may skip validation when processing certain inputs
Source: CVE Program / CVE List V5
Vulnerability 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
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
MongoDB C Driver 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MongoDB C Driver是MongoDB开源的一个用于在C语言程序中连接和操作MongoDB数据库的客户端驱动库。 MongoDB C Driver 1.30.5之前版本、2.0.0版本和2.0.1版本存在安全漏洞，该漏洞源于bson_validate函数可能提前返回并错误报告成功，导致跳过BSON数据验证，可能允许处理格式错误或无效的UTF-8序列。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
MongoDB Inc. C Driver 1.0 ~ 1.30.5 -

II. Public POCs for CVE-2026-6231

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III. Intelligence Information for CVE-2026-6231

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Patches & Fixes for CVE-2026-6231 (1)

IV. Related Vulnerabilities

Same product: C Driver
Same vendor: MongoDB Inc.
Same weakness: CWE-20

V. Comments for CVE-2026-6231

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