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Rabbitmq server: RabbitMQ is a messaging and streaming broker. (CVE-2026-67234)

0
Medium
VulnerabilityCVE-2026-67234gcveosvubuntu-cve-2026-67234cve-2026-67234ubuntu-pro-16-04-ltsubuntu-pro-18-04-ltsubuntu-pro-20-04-ltsubuntu-22-04-ltsubuntu-24-04-ltsubuntu-26-04-lts
Published: 09/25/2026 (09/25/2026, 17:17:00 UTC)
Source: GCVE Database
Product: rabbitmq-server

Description

A vulnerability in RabbitMQ server versions from 4.2.0 up to but not including 4.2.8 and version 4.3.2 causes non-ASCII cookie names due to improper handling of authentication mechanism atoms. This violates RFC 6265 and can prevent browsers from deleting stale authentication-mechanism cookies, causing preferences to persist across logout and login cycles. The issue does not allow code execution or data exfiltration and is fixed in versions 4.2.8 and 4.3.2.

CVSS v4.0

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
Present
Privileges Required
None
User Interaction
Passive
Vuln. Confidentiality
None
Vuln. Integrity
Low
Vuln. Availability
None
Subsq. Confidentiality
None
Subsq. Integrity
None
Subsq. Availability
None
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/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:26.04: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

Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.

AI-Powered Analysis

Machine-generated threat intelligence

AILast updated: 10/18/2026, 00:01:46 UTC

Technical Analysis

RabbitMQ server versions 4.2.0 through 4.2.7 and 4.3.2 have a flaw in the get_auth_mechanism/1 function where term_to_binary/1 is applied to strict_auth_mechanism or preferred_auth_mechanism atoms, resulting in non-ASCII cookie names. This violates RFC 6265 cookie specifications and can cause browsers to fail to delete authentication-mechanism cookies, leading to stale preferences persisting after logout and login. The vulnerability does not enable code execution or data exfiltration. The issue is resolved in RabbitMQ versions 4.2.8 and 4.3.2.

Potential Impact

The vulnerability's impact is limited to the persistence of stale authentication-mechanism preferences across logout and login cycles due to non-deleted cookies. There is no direct risk of code execution, data exfiltration, or other security breaches.

Mitigation Recommendations

This issue is fixed in RabbitMQ versions 4.2.8 and 4.3.2. Users should upgrade to these or later versions to remediate the vulnerability. No other mitigation actions are necessary.

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Technical Details

Gcve Source
db.gcve.eu
Osv Id
UBUNTU-CVE-2026-67234
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:26.04:LTS"]
Cvss Version
4.0
State
PUBLISHED

Threat ID: 6ad3f5aa2cdf04f6566627ef

Added to database: 10/17/2026, 22:24:42 UTC

Last enriched: 10/18/2026, 00:01:46 UTC

Last updated: 10/18/2026, 00:01:46 UTC

Views: 2

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