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CVE-2026-81529— Connection-option injection via unescaped settings in the canonical MongoDB URL builder

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 3.5.0版本至3.11.1之前版本存在命令注入漏洞，该漏洞源于连接URL构造中分隔符中和不当，可能导致低权限用户引入或抑制安全相关连接设置。

CVSS 7.1 · High EPSS 0.29% · P20

Affected Version Matrix 1

VendorProduct Version RangeStatus
MongoDB C# Driver 2.0.0< 3.11.1 affected
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I. Basic Information for CVE-2026-81529

Vulnerability Information
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Vulnerability Title
Connection-option injection via unescaped settings in the canonical MongoDB URL builder
Source: CVE Program / CVE List V5
Vulnerability Description
Improper neutralization of delimiters in connection-URL construction allows connection-option injection in the MongoDB C# Driver. When an application passes untrusted text into the driver's connection-URL builder and round-trips the builder back into a client configuration, the untrusted text is serialized without neutralizing the URL/option delimiters and is then re-parsed as authoritative connection options. A low-privileged user of such an application can thereby introduce or suppress security-relevant connection settings.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
参数注入或修改
Source: CVE Program / CVE List V5
Vulnerability Title
MongoDB C# Driver 命令注入漏洞
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 3.5.0版本至3.11.1之前版本存在命令注入漏洞，该漏洞源于连接URL构造中分隔符中和不当，可能导致低权限用户引入或抑制安全相关连接设置。
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 2.0.0 ~ 3.11.1 -

II. Public POCs for CVE-2026-81529

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III. Intelligence Information for CVE-2026-81529

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Vendor Pages for CVE-2026-81529 (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-2026-81521 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-2026-81528 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-88

V. Comments for CVE-2026-81529

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