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CVE-2026-81525— Cross-tenant database retargeting via dot/NUL injection in namespace strings in the PHP Driver

Quick assessment

Affected
MongoDB PHP Library
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 PHP Driver是美国MongoDB公司开源的一个数据库驱动程序。 MongoDB PHP Driver 1.0.0版本至2.4.1之前版本存在输入验证错误漏洞，该漏洞源于对应用提供的命名空间标识符中的特殊元素清理不足，可能导致数据库操作被静默导向不同的存储位置。

CVSS 8.1 · High EPSS 0.49% · P41

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 4

VendorProduct Version RangeStatus
MongoDB PHP Extension < 1.21.6 affected
2.0.0< 2.4.1 affected
MongoDB PHP Library < 1.21.4 affected
2.0.0< 2.4.1 affected
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I. Basic Information for CVE-2026-81525

Vulnerability Information
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Vulnerability Title
Cross-tenant database retargeting via dot/NUL injection in namespace strings in the PHP Driver
Source: CVE Program / CVE List V5
Vulnerability Description
The MongoDB client library for PHP does not sufficiently sanitize special elements in application-supplied namespace identifiers before using them to construct the target namespace for database operations. An application that incorporates untrusted text into these identifiers may have operations silently directed at a different storage location than the one the application intended.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/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 PHP Driver 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MongoDB PHP Driver是美国MongoDB公司开源的一个数据库驱动程序。 MongoDB PHP Driver 1.0.0版本至2.4.1之前版本存在输入验证错误漏洞，该漏洞源于对应用提供的命名空间标识符中的特殊元素清理不足，可能导致数据库操作被静默导向不同的存储位置。
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 PHP Library 0 ~ 1.21.4 -
MongoDB PHP Extension 0 ~ 1.21.6 -

II. Public POCs for CVE-2026-81525

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III. Intelligence Information for CVE-2026-81525

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Vendor Pages for CVE-2026-81525 (5)

Other References for CVE-2026-81525 (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-2026-81529 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-2026-81524 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 vendor: MongoDB
Same weakness: CWE-943

V. Comments for CVE-2026-81525

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