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CVE-2026-81524— Cross-tenant database retargeting via dot/NUL injection in namespace strings in the C Driver

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 驱动中存在一个弱点：当驱动为操作构建目标命名空间时，调用方提供的数据库名称和集合名称组件中的特殊元素未经过净化处理即可通过。如果应用程序将这些名称组件中包含不可信输入，则可能导致操作被导向非预期的资源。

CVSS 5.4 · Medium
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I. Basic Information for CVE-2026-81524

Vulnerability Information
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Vulnerability Title
Cross-tenant database retargeting via dot/NUL injection in namespace strings in the C Driver
Source: CVE Program / CVE List V5
Vulnerability Description
A weakness in the MongoDB C Driver allows special elements in caller-supplied database and collection name components to pass without sanitization when the driver composes the target namespace for an operation. An application that incorporates untrusted input into these name components can have operations directed at a resource other than the one intended.
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
对资源描述符的控制不恰当(资源注入)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
MongoDB C Driver 1.0.0 ~ 2.5.1 -

II. Public POCs for CVE-2026-81524

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III. Intelligence Information for CVE-2026-81524

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Vendor Pages for CVE-2026-81524 (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-2026-81528 5.4 MEDIUM NoSQL injection via array replacement bypassing update shape validation in driver write pa
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-99

V. Comments for CVE-2026-81524

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