---
id: CVE-2026-82059
title: >-
  An internal aggregation expression in MongoDB Server was incorrectly
  registered as accessible to any authenticated user rather than being
  restricted to internal cluster operations
summary: >-
  An internal aggregation expression in MongoDB Server was incorrectly
  registered as accessible to any authenticated user rather than being
  restricted to internal cluster operations. By crafting a malformed index
  specification within this …
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-617
vendor: mongodb
product: mongodb
affected:
  - 'mongodb >= 7.0.0, < 7.0.41'
  - 'mongodb >= 8.0.0, < 8.0.30'
  - 'mongodb >= 8.3.0, < 8.3.9'
patched:
  - mongodb 8.3.9
published: '2026-09-08'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T20:36:07.327'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-82059'
references:
  - url: 'https://jira.mongodb.org/browse/SERVER-130571'
    label: cna@mongodb.com
tags:
  - nvd
  - cve.org
epss: 0.00258
epssPercentile: 0.17808
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-08T17:59:17.643641Z'
ingestedAt: '2026-09-08T16:34:19.257Z'
---

## Overview

An internal aggregation expression in MongoDB Server was incorrectly registered as accessible to any authenticated user rather than being restricted to internal cluster operations. By crafting a malformed index specification within this expression, an authenticated user with read-only privileges could trigger an assertion failure in the index key generation code path. In certain build configurations, this assertion failure results in termination of the mongod process, causing a denial of service to all connected clients.

## Affected

- `mongodb >= 7.0.0, < 7.0.41`
- `mongodb >= 8.0.0, < 8.0.30`
- `mongodb >= 8.3.0, < 8.3.9`

## Remediation

Upgrade past the affected range:

- `mongodb 8.3.9`