---
id: CVE-2026-95844
title: Moquette is a lightweight Java MQTT broker
summary: >-
  Moquette is a lightweight Java MQTT broker. Prior to 0.18.1, Moquette does not
  limit the depth of topic names and topic filters before processing them
  through recursive CTrie insertion and matching operations. A remote client can
  publish…
severity: high
cvss: 8.7
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'
cwe:
  - CWE-674
vendor: moquette-io
product: moquette
affected:
  - moquette < 0.18.1
published: '2026-09-23'
updated: '2026-09-23'
sourceUpdated: '2026-09-23T18:12:04.247'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-95844'
references:
  - url: >-
      https://github.com/moquette-io/moquette/commit/ca17e0be19e86d5e291f4532dfdc94616c8e0049
    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
cvssSource: cna
ingestedAt: '2026-09-23T17:28:14.850Z'
epss: 0.00291
epssPercentile: 0.19281
---

## Overview

Moquette is a lightweight Java MQTT broker. Prior to 0.18.1, Moquette does not limit the depth of topic names and topic filters before processing them through recursive CTrie insertion and matching operations. A remote client can publish or subscribe with a deeply nested topic, causing a StackOverflowError that disrupts session processing and can deny service to broker clients. This issue is fixed in version 0.18.1.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.