Detections
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RabbitMQ 4.2.x < 4.2.8 / 4.3.x < 4.3.2 Non-RFC-Conformant Auth Mechanism Cookie Name

low Nessus Plugin ID 362550

Synopsis

The RabbitMQ installed on the remote host is affected by a vulnerability.

Description

The version of RabbitMQ installed on the remote host is 4.2.x prior to 4.2.8, or 4.3.x prior to 4.3.2. It is, therefore, affected by a vulnerability:

 - get_auth_mechanism/1 used term_to_binary/1 on the strict_auth_mechanism or preferred_auth_mechanism atom when clearing the corresponding cookie, producing a non-ASCII cookie name that violates RFC 6265 and can prevent the browser from deleting the preference. The issue is not directly exploitable for code execution or data exfiltration; its security relevance is limited to stale authentication mechanism preferences persisting across logout and login cycles. (CVE-2026-67234)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Upgrade to RabbitMQ version 4.2.8, 4.3.2, or later.

See Also

http://www.nessus.org/u?f7de6b5f

Plugin Details

Severity: Low

ID: 362550

File Name: rabbitmq_auth_mech_cookie_4_2_8.nasl

Version: 1.1

Type: Local

Agent: windows, macosx, unix

Family: Misc.

Published: 10/2/2026

Updated: 10/2/2026

Configuration: Enable paranoid mode, Enable thorough checks (optional)

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.34

CVSS v2

Risk Factor: High

Base Score: 7.5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P

CVSS Score Source: CVE-2026-67234

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v4

Risk Factor: Low

Base Score: 2.3

Vector: 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

Vulnerability Information

CPE: cpe:/a:pivotal_software:rabbitmq, cpe:/a:vmware:rabbitmq

Required KB Items: installed_sw/RabbitMQ, Settings/ParanoidReport

Patch Publication Date: 7/9/2026

Vulnerability Publication Date: 7/9/2026

Reference Information

CVE: CVE-2026-67234