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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 C驱动程序中客户端加密配置层的缺陷，会导致应用提供的敏感密钥管理凭据在驱动对其客户端设置的人类可读诊断表示中按原样复现，而未被像其他机密字段那样进行掩码处理。因此，能够读取应用日志、诊断输出或进程内存转储的一方，可能会恢复明文凭据，并利用它们来解密受保护的字段数据。

CVSS 5.6 · Medium

Possible ATT&CK Techniques 1 AI

T1557.005
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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

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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