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CVE-2026-81528— NoSQL injection via array replacement bypassing update shape validation in driver write path

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 2.9.0版本至3.11.1之前版本存在输入验证错误漏洞，该漏洞源于文档替换代码路径缺少元素名称/形状验证，导致查询语言特殊元素未被中和，可能导致攻击者将不受信任的松散类型输入作为替换值，被数据库解释为更新逻辑而非数据，并在应用程序自身数据库凭据下执行。

CVSS 5.4 · Medium EPSS 0.28% · P19

Affected Version Matrix 1

VendorProduct Version RangeStatus
MongoDB C# Driver 2.9.0< 3.11.1 affected
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I. Basic Information for CVE-2026-81528

Vulnerability Information
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Vulnerability Title
NoSQL injection via array replacement bypassing update shape validation in driver write path
Source: CVE Program / CVE List V5
Vulnerability Description
A MongoDB C# driver document-replacement code path omits the element-name/shape validation that the equivalent write paths apply, so a value supplied as a replacement is forwarded to the server without neutralization of query-language special elements. An application that passes untrusted, loosely-typed input as a replacement value therefore allows that input to be interpreted by the database as update logic rather than as data, executing under the application's own database credentials. Applications using strongly-typed document mappings are not affected.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
数据查询逻辑中特殊元素的不当中和
Source: CVE Program / CVE List V5
Vulnerability Title
MongoDB C# Driver 输入验证错误漏洞
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 2.9.0版本至3.11.1之前版本存在输入验证错误漏洞，该漏洞源于文档替换代码路径缺少元素名称/形状验证，导致查询语言特殊元素未被中和，可能导致攻击者将不受信任的松散类型输入作为替换值，被数据库解释为更新逻辑而非数据，并在应用程序自身数据库凭据下执行。
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 2.9.0 ~ 3.11.1 -

II. Public POCs for CVE-2026-81528

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III. Intelligence Information for CVE-2026-81528

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Other References for CVE-2026-81528 (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-2026-81530 5.6 MEDIUM KMS master key exposure via unredacted credential serialization in driver settings string
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-943

V. Comments for CVE-2026-81528

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