CVE-2026-67409: rabbitmq server from 3.13.0 (inclusive), before 3.13.18 (exclusive), from 4.0.0 (inclusive), before 4.0.23…

Affected technology

rabbitmq server · from 3.13.0 (inclusive), before 3.13.18 (exclusive)
broadcom

rabbitmq server · from 4.0.0 (inclusive), before 4.0.23 (exclusive)
broadcom

rabbitmq server · from 4.1.0 (inclusive), before 4.1.14 (exclusive)
broadcom

rabbitmq server · from 4.2.0 (inclusive), before 4.2.9 (exclusive)
broadcom

rabbitmq server · from 4.3.0 (inclusive), before 4.3.3 (exclusive)
broadcom

rabbitmq-server · >= 4.3.0, < 4.3.3, >= 4.2.0, < 4.2.9, >= 4.1.0, < 4.1.14, >= 4.0.0, < 4.0.23, >= 3.13.0, < 3.13.18
rabbitmq

Component: Not specified by the source

Attack conditions (Vendor/CNA, CVSS 4.0): Network (remote) · No privileges required · No user interaction required

What an attacker can do

A single attacker can deny access to all legitimate OAuth2 users across the entire RabbitMQ. Vendor/CNA’s CVSS 4.0 assessment (base score 8.2/10) rates confidentiality and integrity impact as none; availability impact as high.