---
id: CVE-2026-84968
title: >-
  An out-of-bounds read in the BSON decoding component of the MongoDB PHP driver
  may allow an unauthenticated party who supplies specially formed input to have
  a small amount of adjacent process memory copied into an error message that is
  …
summary: >-
  An out-of-bounds read in the BSON decoding component of the MongoDB PHP driver
  may allow an unauthenticated party who supplies specially formed input to have
  a small amount of adjacent process memory copied into an error message that is
  …
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N'
cwe:
  - CWE-125
vendor: mongodb
product: php_driver
affected:
  - 'php_driver >= 1.15.0, < 1.21.9'
  - 'php_driver >= 2.0.0, < 2.1.9'
  - 'php_driver >= 2.2.0, < 2.5.2'
patched:
  - php_driver 2.5.2
published: '2026-09-03'
updated: '2026-09-10'
sourceUpdated: '2026-09-10T20:39:21.967'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-84968'
references:
  - url: 'https://jira.mongodb.org/browse/PHPC-2744'
    label: cna@mongodb.com
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-84968.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-84968'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-84968'
tags:
  - nvd
  - csaf
  - vex
  - red-hat
epss: 0.0033
epssPercentile: 0.2354
ingestedAt: '2026-09-08T19:08:49.591Z'
---

## Overview

An out-of-bounds read in the BSON decoding component of the MongoDB PHP driver may allow an unauthenticated party who supplies specially formed input to have a small amount of adjacent process memory copied into an error message that is returned to application code. This may result in unintended disclosure of limited memory contents.

## Affected

- `php_driver >= 1.15.0, < 1.21.9`
- `php_driver >= 2.0.0, < 2.1.9`
- `php_driver >= 2.2.0, < 2.5.2`

## Remediation

Upgrade past the affected range:

- `php_driver 2.5.2`

## Vendor advisories

- **Red Hat VEX** · updated 2026-09-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-84968.json)