Cross-tenant database retargeting via dot/NUL injection in namespace strings in the PHP Driver (CVE-2026-81525) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-81525

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

Answer in brief

CVE-2026-81525 records a Unknown severity 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/PHP Driver (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 27, 2026Updated Aug 27, 2026Source checked Aug 27, 2026First seen by HOL Aug 27, 2026Material review Aug 27, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. 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.

Affected scope and exposure questions

The current feed maps MongoDB/PHP Driver (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
MongoDB/PHP Drivergeneric	>=1.0.0 <2.4.1	2.4.1

Recommended response

Check inventory. Check lockfiles and deployed manifests for MongoDB/PHP Driver.
Review the reported fix. Update MongoDB/PHP Driver to 2.4.1 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 27, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 27, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 27, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.