Bug 2541497 (CVE-2026-67230)

Summary: CVE-2026-67230 rabbitmq-server: rabbitmq-server: Denial of Service via unbounded pre-authentication state accumulation in Web STOMP
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: eglynn, jjoyce, jpretori, jschluet, lhh, mburns, mgarciac
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in RabbitMQ. When the Web STOMP plugin is enabled, the WebSocket handler fails to enforce maximum frame size limits or login timeouts prior to client authentication. An unauthenticated remote attacker can exploit this vulnerability by sending a continuous stream of small frames to keep connections open and accumulate pre-authentication state, leading to resource exhaustion and a Denial of Service (DoS).
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Description OSIDB Bzimport 2026-09-25 16:41:12 UTC 
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.