CVE-2026-81525 HIGH

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

Vendor Mongodb
Product PHP Library
Weakness CWE-943
Published August 27, 2026
Last update August 28, 2026

CVSS base score

8.6/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality
Integrity

CVSS 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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

August 27, 2026 CVE published
August 28, 2026 Record updated