Answer in brief
CVE-2026-81525 records a High severity (CVSS 8.1) vulnerability in Cross-tenant database retargeting via dot/NUL injection in namespace strings in the PHP Driver. The current sources do not mark it as known exploited. The current feed maps mongodb/mongodb (composer), mongodb/mongodb (composer), MongoDB/PHP Driver (generic), MongoDB/PHP Extension (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 8.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps mongodb/mongodb (composer), mongodb/mongodb (composer), MongoDB/PHP Driver (generic), MongoDB/PHP Extension (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:a:mongodb:php_driver:*:*:*:*:*:mongodb:*:* | Not reported | Not reported |
| cpe:2.3:a:mongodb:php_library:*:*:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| mongodb/mongodbcomposer | <1.21.4 | 1.21.4 |
| mongodb/mongodbcomposer | >=2.0.0,<2.4.1 | 2.4.1 |
| MongoDB/PHP Drivergeneric | >=1.0.0 <2.4.1 | 2.4.1 |
| MongoDB/PHP Extensiongeneric | >=0 <1.21.6 || >=2.0.0 <2.4.1 | 1.21.6, 2.4.1 |
| MongoDB/PHP Librarygeneric | >=0 <1.21.4 || >=2.0.0 <2.4.1 | 1.21.4, 2.4.1 |
| mongodb/mongodbpackagist | >=0 <1.21.4 | 1.21.4 |
| mongodb/mongodbpackagist | >=2.0.0 <2.4.1 | 2.4.1 |
Published upstream
Aug 27, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 29, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 27, 2026
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.
Quoted source text, attributed separately from HOL analysis.