High · published September 25, 2026
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.
| Product | Versions | Fixed in |
|---|---|---|
| broadcom/rabbitmq_server | ≥ 3.13.0, < 3.13.15 | 3.13.15 |
| broadcom/rabbitmq_server | ≥ 4.0.0, < 4.0.20 | 4.0.20 |
| broadcom/rabbitmq_server | ≥ 4.1.0, < 4.1.11 | 4.1.11 |
| broadcom/rabbitmq_server | ≥ 4.2.0, < 4.2.6 | 4.2.6 |