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Rabbitmq server: RabbitMQ is a messaging and streaming broker. (CVE-2026-67407)

0
Medium
VulnerabilityCVE-2026-67407gcveosvubuntu-cve-2026-67407cve-2026-67407ubuntu-pro-16-04-ltsubuntu-pro-18-04-ltsubuntu-pro-20-04-ltsubuntu-22-04-ltsubuntu-24-04-ltsubuntu-26-10ubuntu-26-04-lts
Published: 09/25/2026 (09/25/2026, 17:17:00 UTC)
Source: GCVE Database
Product: rabbitmq-server

Description

RabbitMQ versions prior to 4.3.3, 4.2.9, 4.1.14, and 4.0.23 contain an incomplete fix for CVE-2026-44838, resulting in a topic permission bypass vulnerability in MQTT. The issue arises because the escaperegexchar/1 function does not escape the '-' character, allowing a low-privileged authenticated MQTT user to broaden topic authorization by manipulating the clientid in topic permission templates. This vulnerability affects multiple specific older versions of RabbitMQ server and has been fixed in the stated versions.

CVSS v4.0

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
Present
Privileges Required
Low
User Interaction
None
Vuln. Confidentiality
None
Vuln. Integrity
None
Vuln. Availability
None
Subsq. Confidentiality
Low
Subsq. Integrity
High
Subsq. Availability
None
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:L/SI:H/SA:N

Affected software

Ubuntu:Pro:16.04:LTSmore threats →ghsa
rabbitmq-server
pkg:deb/ubuntu/rabbitmq-server?arch=source&distro=esm-infra-legacy/xenial
Affected versions
=3.5.4-1=3.5.4-3=3.5.4-3.1=3.5.7-1=3.5.7-1ubuntu0.16.04.1=3.5.7-1ubuntu0.16.04.2=3.5.7-1ubuntu0.16.04.4=3.5.7-1ubuntu0.16.04.4+esm1=3.5.7-1ubuntu0.16.04.4+esm2=3.5.7-1ubuntu0.16.04.4+esm3
Ubuntu:Pro:18.04:LTSmore threats →ghsa
rabbitmq-server
pkg:deb/ubuntu/rabbitmq-server?arch=source&distro=esm-infra/bionic
Affected versions
=3.6.10-1=3.6.10-1ubuntu0.1=3.6.10-1ubuntu0.3=3.6.10-1ubuntu0.4=3.6.10-1ubuntu0.5=3.6.10-1ubuntu0.5+esm1
Ubuntu:Pro:20.04:LTSmore threats →ghsa
rabbitmq-server
pkg:deb/ubuntu/rabbitmq-server?arch=source&distro=esm-infra/focal
Affected versions
=3.7.8-4ubuntu2=3.7.18-1=3.8.2-0ubuntu1=3.8.2-0ubuntu1.1=3.8.2-0ubuntu1.2=3.8.2-0ubuntu1.3=3.8.2-0ubuntu1.4=3.8.2-0ubuntu1.5=3.8.3-0ubuntu0.1=3.8.3-0ubuntu0.2=3.8.3-0ubuntu0.3=3.8.3-0ubuntu0.3+esm1=3.8.3-0ubuntu0.3+esm2
Ubuntu:22.04:LTSmore threats →ghsa
rabbitmq-server
pkg:deb/ubuntu/rabbitmq-server?arch=source&distro=jammy
Affected versions
=3.8.9-3ubuntu1=3.9.8-1=3.9.8-2=3.9.8-3=3.9.8-5=3.9.8-6=3.9.13-1=3.9.13-1ubuntu0.22.04.1=3.9.13-1ubuntu0.22.04.2=3.9.27-0ubuntu0.1=3.9.27-0ubuntu0.2=3.9.27-0ubuntu0.5=3.9.27-0ubuntu0.6
Ubuntu:24.04:LTSmore threats →ghsa
rabbitmq-server
pkg:deb/ubuntu/rabbitmq-server?arch=source&distro=noble
Affected versions
=3.12.1-1=3.12.1-1ubuntu1=3.12.1-1ubuntu1.2=3.12.1-1ubuntu1.4=3.12.1-1ubuntu1.6=3.12.1-1ubuntu1.7
Ubuntu:26.10more threats →ghsa
rabbitmq-server
pkg:deb/ubuntu/rabbitmq-server?arch=source&distro=stonking
Affected versions
=4.0.5-10ubuntu5=4.3.2-4ubuntu2=4.3.2-4ubuntu3
Ubuntu:26.04:LTSmore threats →ghsa
rabbitmq-server
pkg:deb/ubuntu/rabbitmq-server?arch=source&distro=resolute
Affected versions
=4.0.5-8ubuntu2=4.0.5-10ubuntu1=4.0.5-10ubuntu2=4.0.5-10ubuntu3=4.0.5-10ubuntu4=4.0.5-10ubuntu5=4.0.5-10ubuntu5.1=4.0.5-10ubuntu5.2

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AI-Powered Analysis

Machine-generated threat intelligence

AILast updated: 10/17/2026, 23:55:59 UTC

Technical Analysis

This vulnerability (CVE-2026-67407) in RabbitMQ is an incomplete fix of a previous issue (CVE-2026-44838) where the function escaperegexchar/1 fails to escape the '-' character in MQTT topic permission templates. When the {clientid} variable is embedded inside a character class in topic permission templates, a low-privileged authenticated MQTT user can exploit this to bypass topic permission restrictions, gaining broader read and write access. The issue is resolved in RabbitMQ versions 4.3.3, 4.2.9, 4.1.14, and 4.0.23.

Potential Impact

A low-privileged authenticated MQTT user can bypass topic permission restrictions, potentially allowing unauthorized read and write access to MQTT topics. This could lead to unauthorized message publishing or subscription, impacting confidentiality and integrity of messaging data within affected RabbitMQ deployments.

Mitigation Recommendations

Upgrade RabbitMQ to versions 4.3.3, 4.2.9, 4.1.14, or 4.0.23 or later where this vulnerability is fixed. No other mitigation is indicated by the vendor advisory.

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Technical Details

Gcve Source
db.gcve.eu
Osv Id
UBUNTU-CVE-2026-67407
Osv Schema Version
1.7.0
Ecosystems
["Ubuntu:Pro:16.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:22.04:LTS","Ubuntu:24.04:LTS","Ubuntu:26.10","Ubuntu:26.04:LTS"]
Cvss Version
4.0
State
PUBLISHED

Threat ID: 6ad3f5a72cdf04f6566627db

Added to database: 10/17/2026, 22:24:39 UTC

Last enriched: 10/17/2026, 23:55:59 UTC

Last updated: 10/17/2026, 23:55:59 UTC

Views: 2

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