Bug 2539766 (CVE-2026-66067) - CVE-2026-66067 rabbitmq: RabbitMQ: Authenticated user can bypass connection limits via stream protocol
Summary: CVE-2026-66067 rabbitmq: RabbitMQ: Authenticated user can bypass connection l...
Keywords:
Status: NEW
Alias: CVE-2026-66067
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
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Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-09-23 20:34 UTC by OSIDB Bzimport
Modified: 2026-09-24 06:30 UTC (History)
0 users

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Description OSIDB Bzimport 2026-09-23 20:34:38 UTC
RabbitMQ is a messaging and streaming broker. Prior to versions 4.2.7 and 4.3.1, The stream open handler calls only check_vhost_access; it omits the node/vhost/user connection-limit checks that rabbit_reader performs for AMQP. A developer %% FIXME comment at the cited line explicitly acknowledges the gap. No compensating enforcement exists in connection tracking or elsewhere in rabbitmq_stream. An authenticated tenant can fully bypass operator-configured per-user and per-vhost connection caps by connecting via port 5552 instead of 5672. Preconditions include rabbitmq_stream plugin enabled Authenticated stream-protocol credentials Operator relies on per-user/per-vhost connection limits for tenant isolation. This issue is fixed in versions 4.2.7 and 4.3.1.


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