---
id: CVE-2026-81526
title: >-
  The MongoDB Rust Driver does not neutralize special characters in a
  caller-supplied target identifier before embedding it in the request it sends
  to the server
summary: >-
  The MongoDB Rust Driver does not neutralize special characters in a
  caller-supplied target identifier before embedding it in the request it sends
  to the server. An actor able to influence that identifier in an application
  using the drive…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N'
cwe:
  - CWE-74
vendor: mongodb
product: rust_driver
affected:
  - 'rust_driver >= 3.0.0, < 3.8.2'
patched:
  - rust_driver 3.8.2
published: '2026-08-27'
updated: '2026-09-29'
sourceUpdated: '2026-09-29T19:16:45.363'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-81526'
references:
  - url: 'https://github.com/mongodb/mongo-rust-driver/releases/tag/v3.8.2'
    label: cna@mongodb.com
  - url: 'https://jira.mongodb.org/browse/RUST-2467'
    label: cna@mongodb.com
tags:
  - nvd
epss: 0.00349
epssPercentile: 0.25942
ingestedAt: '2026-09-29T19:44:04.117Z'
---

## Overview

The MongoDB Rust Driver does not neutralize special characters in a caller-supplied target identifier before embedding it in the request it sends to the server. An actor able to influence that identifier in an application using the driver may cause write operations to be applied to an unintended target within the same deployment using the application's own credentials. This may result in unauthorized modification of data belonging to another logical boundary enforced by the application.

## Affected

- `rust_driver >= 3.0.0, < 3.8.2`

## Remediation

Upgrade past the affected range:

- `rust_driver 3.8.2`