Allocation of Resources Without Limits or Throttling in RabbitMQ Server - CVE-2026-67219
Published: July 9, 2026 / Updated: September 28, 2026
Vulnerability identifier: #VU137246
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-2026-67219
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 consistent-hash exchange binding handling when processing a queue binding request with an excessively large routing-key weight. A remote user can create a binding with an arbitrarily large integer weight to cause a denial of service.
Only instances with the rabbitmq_consistent_hash_exchange plugin enabled are vulnerable, and the oversized allocation is replicated across cluster nodes and persists across restarts.
Affected software
RabbitMQ Server
How to mitigate CVE-2026-67219
Install security update from vendor's website.
RabbitMQ Server - addressed in versions 3.13.15, 4.0.20, 4.1.11, 4.2.6