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.

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
MongoDB PHP Library unaffected
Version Status Constraints
0 affected < 1.21.4
2.0.0 affected < 2.4.1
MongoDB PHP Extension unaffected
Version Status Constraints
0 affected < 1.21.6
2.0.0 affected < 2.4.1

No data.

No data.

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Project Subscriptions

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Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/mongodb/mongo-php-driver/releases/tag/1.21.6 cve-icon cve-icon
https://github.com/mongodb/mongo-php-driver/releases/tag/2.4.1 cve-icon cve-icon
https://github.com/mongodb/mongo-php-library/releases/tag/1.21.4 cve-icon cve-icon
https://github.com/mongodb/mongo-php-library/releases/tag/2.4.1 cve-icon cve-icon
https://jira.mongodb.org/browse/PHPLIB-1927 cve-icon cve-icon
History

Thu, 27 Aug 2026 18:00:00 +0000

Type Values Removed Values Added
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.
Title Cross-tenant database retargeting via dot/NUL injection in namespace strings in the PHP Driver
Weaknesses CWE-943
References
Metrics cvssV3_1

{'score': 8.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N'}

cvssV4_0

{'score': 8.6, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: mongodb

Published:

Updated: 2026-08-27T20:42:01.763Z

Reserved: 2026-08-26T22:14:05.297Z

Link: CVE-2026-81525

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-08-27T20:18:50.913

Modified: 2026-08-28T00:18:20.960

Link: CVE-2026-81525

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-28T08:45:17Z

Weaknesses