Vulnerability in MongoDB PHP Driver
CVE-2026-81525
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.005 (40.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 40th percentile — 40.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.005 · change: +0.002
Affected products
Weakness classification (CWE)
References
- github.com/mongodb/mongo-php-driver/releases/tag/1.21.7
- github.com/mongodb/mongo-php-library/releases/tag/2.4.1 (Product, Release Notes)
- jira.mongodb.org/browse/PHPLIB-1927 (Vendor Advisory)
- github.com/mongodb/mongo-php-library/releases/tag/1.21.4 (Product, Release Notes)
- github.com/mongodb/mongo-php-driver/releases/tag/1.21.6 (Product, Release Notes)
- github.com/mongodb/mongo-php-driver/releases/tag/2.4.1 (Product, Release Notes)
Frequently asked questions
- What is CVE-2026-81525?
- CVE-2026-81525 is a high-severity vulnerability in MongoDB PHP Driver, classified under Improper Neutralization of Special Elements in Data Query Logic. CVSS score: 8.1/10. Published 2026-08-27.
- How severe is CVE-2026-81525?
- High severity. CVSS v3 base score is 8.1 out of 10.