CVE-2026-67230: Rabbitmq Rabbitmq-Server

Medium severity, CVSS 6.3. EPSS: 0.5% chance of exploitation in the next 30 days.

RabbitMQ is a messaging and streaming broker. From 3.13.0 until 3.13.15, 4.0.20, 4.1.11, and 4.2.6, the Web STOMP WebSocket handler enforced neither max_frame_size nor login_timeout before authentication, allowing an unauthenticated client to keep a connection alive with a slow stream of small frames and accumulate unbounded pre-authentication state. The rabbitmq_web_stomp plugin must be enabled, and no authentication is required to reach the vulnerable path. This issue is fixed in versions 3.13.15, 4.0.20, 4.1.11, and 4.2.6.

Affected products

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

Published 2026-09-25. Last modified 2026-09-29.