Allocation of Resources Without Limits or Throttling in RabbitMQ Server - CVE-2026-66067
Published: July 9, 2026 / Updated: September 28, 2026
Vulnerability identifier: #VU137230
CSH Severity: Low
CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-66067
CWE-ID: CWE-770
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to cause a denial of service.
The vulnerability exists due to allocation of resources without limits or throttling in the stream open handler when handling stream protocol connections over port 5552. A remote user can open excessive stream connections to cause a denial of service.
Exploitation requires valid stream-protocol credentials, the rabbitmq_stream plugin to be enabled, and reliance on per-user or per-vhost connection limits for tenant isolation.
Affected software
RabbitMQ Server
How to mitigate CVE-2026-66067
Install security update from vendor's website.
RabbitMQ Server - addressed in versions 4.2.7, 4.3.1