---
id: CVE-2026-18692
title: >-
  An issue in MongoDB Server's handling of timeseries bucket lifecycle could
  allow an authenticated user with write privileges to cause an internal
  reference to be used after the underlying memory has been freed
summary: >-
  An issue in MongoDB Server's handling of timeseries bucket lifecycle could
  allow an authenticated user with write privileges to cause an internal
  reference to be used after the underlying memory has been freed. Subsequent
  operations coul…
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-416
vendor: mongodb
product: mongodb
affected:
  - 'mongodb >= 8.0.0, < 8.0.29'
  - 'mongodb >= 8.2.0, <= 8.2.12'
  - 'mongodb >= 8.3.0, < 8.3.8'
  - mongodb = 9.0.0
  - mongodb = 9.1.0
patched:
  - mongodb 8.3.8
published: '2026-08-11'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T15:16:27.380'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-18692'
references:
  - url: 'https://jira.mongodb.org/browse/SERVER-129887'
    label: cna@mongodb.com
tags:
  - nvd
epss: 0.00575
epssPercentile: 0.45145
ingestedAt: '2026-08-29T19:41:15.561Z'
---

## Overview

An issue in MongoDB Server's handling of timeseries bucket lifecycle could allow an authenticated user with write privileges to cause an internal reference to be used after the underlying memory has been freed. Subsequent operations could then result in a server crash or, potentially, execution of unintended code.

## Affected

- `mongodb >= 8.0.0, < 8.0.29`
- `mongodb >= 8.2.0, <= 8.2.12`
- `mongodb >= 8.3.0, < 8.3.8`
- `mongodb = 9.0.0`
- `mongodb = 9.1.0`

## Remediation

Upgrade past the affected range:

- `mongodb 8.3.8`