---
id: CVE-2026-81522
title: >-
  A weakness in the MongoDB C++ Driver's handling of caller-supplied namespace
  identifiers allows special characters embedded in those identifiers
summary: >-
  A weakness in the MongoDB C++ Driver's handling of caller-supplied namespace
  identifiers allows special characters embedded in those identifiers. An
  application that builds a namespace identifier from untrusted input without
  validating i…
severity: high
cvss: 8.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N'
cwe:
  - CWE-116
  - CWE-140
vendor: mongodb
product: c++_driver
affected:
  - 'c++_driver >= 3.0.0, < 4.5.2'
patched:
  - c++_driver 4.5.2
published: '2026-08-27'
updated: '2026-09-29'
sourceUpdated: '2026-09-29T19:17:22.457'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-81522'
references:
  - url: 'https://github.com/mongodb/mongo-cxx-driver/releases/tag/r4.5.1'
    label: cna@mongodb.com
  - url: 'https://jira.mongodb.org/browse/CXX-3552'
    label: cna@mongodb.com
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-81522.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-81522'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2525240'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-81522'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-81522'
tags:
  - nvd
  - csaf
  - vex
  - red-hat
epss: 0.00462
epssPercentile: 0.39896
ingestedAt: '2026-08-29T21:42:36.301Z'
---

## Overview

A weakness in the MongoDB C++ Driver's handling of caller-supplied namespace identifiers allows special characters embedded in those identifiers. An application that builds a namespace identifier from untrusted input without validating it may therefore have its operation directed at a different target than intended. This can result in limited unauthorized read and write access to data belonging to another logical tenant of the affected application.

## Affected

- `c++_driver >= 3.0.0, < 4.5.2`

## Remediation

Upgrade past the affected range:

- `c++_driver 4.5.2`

## Vendor advisories

- **Red Hat VEX** · Important · affected: Logging Subsystem for Red Hat OpenShift · no fix planned: Logging Subsystem for Red Hat OpenShift · updated 2026-10-20 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-81522.json)