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CVE-2026-81530— KMS master key exposure via unredacted credential serialization in driver settings string

Quick assessment

Affected
MongoDB 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 CDriver是美国MongoDB公司的一个C#语言的数据库驱动。 MongoDB CDriver 2.10.0版本至3.11.1之前版本存在日志信息泄露漏洞，该漏洞源于客户端加密配置表面弱点，导致敏感密钥管理凭据材料被原样输出到诊断表示中，可能造成信息泄露，攻击者可利用日志、诊断输出或进程内存转储恢复明文凭据并解密受保护字段数据。

CVSS 5.6 · Medium EPSS 0.09% · P0

Possible ATT&CK Techniques 1 AI

T1557.005

Affected Version Matrix 1

VendorProduct Version RangeStatus
MongoDB C# Driver 2.10.0< 3.11.1 affected
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I. Basic Information for CVE-2026-81530

Vulnerability Information
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Vulnerability Title
KMS master key exposure via unredacted credential serialization in driver settings string
Source: CVE Program / CVE List V5
Vulnerability Description
A weakness in the client-side encryption configuration surface of the MongoDB C# Driver causes sensitive key-management credential material supplied by the application to be reproduced verbatim in the driver's human-readable diagnostic representation of its client settings, instead of being masked as other secret fields are. A party able to read the application's logs, diagnostic output, or a process memory dump may thereby recover the plaintext credentials and use them to decrypt protected field data.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过日志文件的信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
MongoDB C# Driver 日志信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MongoDB C# Driver是美国MongoDB公司的一个C#语言的数据库驱动。 MongoDB C# Driver 2.10.0版本至3.11.1之前版本存在日志信息泄露漏洞，该漏洞源于客户端加密配置表面弱点，导致敏感密钥管理凭据材料被原样输出到诊断表示中，可能造成信息泄露，攻击者可利用日志、诊断输出或进程内存转储恢复明文凭据并解密受保护字段数据。
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 C# Driver 2.10.0 ~ 3.11.1 -

II. Public POCs for CVE-2026-81530

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III. Intelligence Information for CVE-2026-81530

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Other References for CVE-2026-81530 (1)

Same Patch Batch · MongoDB · 2026-08-27 · 12 CVEs total

CVE-2026-81522 8.1 HIGH Cross-tenant database retargeting via dot/NUL injection in namespace strings in the C++ Dr
CVE-2026-81525 8.1 HIGH Cross-tenant database retargeting via dot/NUL injection in namespace strings in the PHP Dr
CVE-2026-81529 7.1 HIGH Connection-option injection via unescaped settings in the canonical MongoDB URL builder
CVE-2026-81521 6.5 MEDIUM Cross-database write retargeting via unvalidated dotted database name in Client.BulkWrite
CVE-2026-81527 6.5 MEDIUM NoSQL injection via unquoted constant GroupBy keys in LINQ pipeline translation
CVE-2026-81526 6.5 MEDIUM Cross-database write redirection via unvalidated dotted database name in bulk write namesp
CVE-2026-75159 5.9 MEDIUM MongoDB BI Connector Improper Memory Handling During Failed Kerberos Authentication May Ca
CVE-2026-81528 5.4 MEDIUM NoSQL injection via array replacement bypassing update shape validation in driver write pa
CVE-2026-81524 5.4 MEDIUM Cross-tenant database retargeting via dot/NUL injection in namespace strings in the C Driv
CVE-2026-75573 4.4 MEDIUM MongoDB Connector for BI mongodrdl Logs TLS Private-Key Password When Duplicate Options Ar
CVE-2026-81523 4.4 MEDIUM Cross-tenant database retargeting via dot/NUL injection in namespace strings in libmongocr

IV. Related Vulnerabilities

Same product: C# Driver
Same vendor: MongoDB
Same weakness: CWE-532

V. Comments for CVE-2026-81530

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