CVE-2026-57216: Broadcom Rabbitmq Server

Critical severity, CVSS 10.0. EPSS: 0.5% chance of exploitation in the next 30 days.

RabbitMQ is a messaging and streaming broker. Prior to 3.13.15, 4.0.20, 4.1.11, and 4.2.6, AMQP 0-9-1, AMQP 1.0, and Stream Protocol authentication can allow a loopback-restricted user such as guest to connect remotely when traffic is accepted through a trusted PROXY-protocol path and the backend listener is loopback-bound because the loopback check uses the listener-side socket address instead of the real client source. This issue is fixed in versions 3.13.15, 4.0.20, 4.1.11, and 4.2.6.

Affected products

• Broadcom Rabbitmq Server: from 3.13.0, before 3.13.15 (fixed in 3.13.15); from 4.0.0, before 4.0.20 (fixed in 4.0.20); from 4.1.0, before 4.1.11 (fixed in 4.1.11); from 4.2.0, before 4.2.6 (fixed in 4.2.6)

Published 2026-07-10. Last modified 2026-10-09.