---
id: CVE-2026-95845
title: Moquette is a lightweight Java MQTT broker
summary: >-
  Moquette is a lightweight Java MQTT broker. Prior to 0.18.1, the broker does
  not enforce a maximum length for pending per-session message queues. When a
  fast publisher sends messages to a slow subscriber whose in-flight window is
  full, q…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-770
vendor: moquette
product: moquette
affected:
  - moquette < 0.18.1
patched:
  - moquette 0.18.1
published: '2026-09-23'
updated: '2026-09-25'
sourceUpdated: '2026-09-25T13:34:37.383'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-95845'
references:
  - url: >-
      https://github.com/moquette-io/moquette/commit/2482cadfba44e615be704b892009a57ce06a1aba
    label: security-advisories@github.com
  - url: 'https://github.com/moquette-io/moquette/releases/tag/v0.18.1'
    label: security-advisories@github.com
  - url: >-
      https://github.com/moquette-io/moquette/security/advisories/GHSA-5f42-97gr-vfhq
    label: security-advisories@github.com
tags:
  - nvd
  - cve.org
epss: 0.00415
epssPercentile: 0.35588
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-23T18:06:26.358093Z'
scores:
  nvd: 7.5
  cna: 8.7
ingestedAt: '2026-09-23T17:28:14.851Z'
---

## Overview

Moquette is a lightweight Java MQTT broker. Prior to 0.18.1, the broker does not enforce a maximum length for pending per-session message queues. When a fast publisher sends messages to a slow subscriber whose in-flight window is full, queued messages can accumulate without bound in memory or persistent storage. Remote clients can use this condition to exhaust broker resources and cause a denial of service. This issue is fixed in version 0.18.1.

## Affected

- `moquette < 0.18.1`

## Remediation

Upgrade past the affected range:

- `moquette 0.18.1`