---
id: CVE-2026-67418
title: RabbitMQ is a messaging and streaming broker
summary: >-
  RabbitMQ is a messaging and streaming broker. From 3.13.0 until 3.13.19,
  4.0.24, 4.1.15, 4.2.10, and 4.3.5, the MQTT 5 parser in
  deps/rabbitmq_mqtt/src/rabbit_mqtt_packet.erl accepts
  Request-Problem-Information on PUBLISH packets even th…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N'
cwe:
  - CWE-248
  - CWE-1286
vendor: rabbitmq
product: rabbitmq-server
affected:
  - 'rabbitmq-server >= 3.13.0, < 3.13.19'
  - 'rabbitmq-server >= 4.0.0, < 4.0.24'
  - 'rabbitmq-server >= 4.1.0, < 4.1.15'
  - 'rabbitmq-server >= 4.2.0, < 4.2.10'
  - 'rabbitmq-server >= 4.3.0, < 4.3.5'
patched:
  - hardened_images
published: '2026-10-14'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T16:00:33.533'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-67418'
references:
  - url: >-
      https://github.com/rabbitmq/rabbitmq-server/commit/4639a4318c72a0660e4bc014767fad70ce288fbc
    label: security-advisories@github.com
  - url: >-
      https://github.com/rabbitmq/rabbitmq-server/commit/908f944a1d581d10774f8d6d0dcf2a1a713779fb
    label: security-advisories@github.com
  - url: 'https://github.com/rabbitmq/rabbitmq-server/pull/17035'
    label: security-advisories@github.com
  - url: 'https://github.com/rabbitmq/rabbitmq-server/pull/17287'
    label: security-advisories@github.com
  - url: 'https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.5'
    label: security-advisories@github.com
  - url: >-
      https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-jv99-v328-mvmm
    label: security-advisories@github.com
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-67418.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-67418'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2552635'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-67418'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-67418'
  - url: 'https://access.redhat.com/errata/RHSA-2026:82703'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.004
epssPercentile: 0.34088
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-14T17:52:54.774490Z'
cvssSource: cna
scores:
  cna: 5.3
  vendor: 4.3
ingestedAt: '2026-10-14T17:44:53.676Z'
---

## Overview

RabbitMQ is a messaging and streaming broker. From 3.13.0 until 3.13.19, 4.0.24, 4.1.15, 4.2.10, and 4.3.5, the MQTT 5 parser in deps/rabbitmq_mqtt/src/rabbit_mqtt_packet.erl accepts Request-Problem-Information on PUBLISH packets even though the property is valid only for CONNECT. An authenticated publisher with topic write permission can cause the broker to store and route that inapplicable property to a separately authenticated matching subscriber. When the subscriber path serializes the outbound PUBLISH, serialise_prop/2 has no matching clause, and the uncontained function_clause exception closes the victim MQTT or Web MQTT connection. The publisher connection and broker remain available, and queued replay, retained-message persistence, and broker-wide denial of service were not established. This issue is fixed in versions 3.13.19, 4.0.24, 4.1.15, 4.2.10, and 4.3.5.

## Remediation

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

## Vendor advisories

- **RHSA-2026:82703** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-10-14 · [advisory](https://access.redhat.com/errata/RHSA-2026:82703)
- **Red Hat VEX** · Moderate · affected: Red Hat Hardened Images, Red Hat OpenStack Platform 13 (Queens), Red Hat OpenStack Platform 16.2, Red Hat OpenStack Platform 17.1, Red Hat OpenStack Platform 18.0 · no fix planned: Red Hat OpenStack Platform 13 (Queens), Red Hat OpenStack Platform 16.2, Red Hat OpenStack Platform 17.1, Red Hat Hardened Images, … · updated 2026-10-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-67418.json)