RabbitMQ is a messaging and streaming broker. From 4.0.0 until 4.0.22 and 4.1.14 and 4.2.7, Admin-only atom exhaustion: PUT /api/users tags list. settags/2 maps rabbitdatacoercion:toatom/1 over the user's tags list. The 20 MB management body limit fits ~3-4M short tag strings. An administrator can crash the node in a single request by creating a user (or importing definitions) with ~1M unique tag administrator. This issue is fixed in versions 4.0.22 and 4.1.14 and 4.2.7.
History

Tue, 20 Oct 2026 13:45:00 +0000

Type Values Removed Values Added
First Time appeared Broadcom
Broadcom rabbitmq Server
CPEs cpe:2.3:a:broadcom:rabbitmq_server:*:*:*:*:*:*:*:*
Vendors & Products Broadcom
Broadcom rabbitmq Server
Metrics cvssV3_1

{'score': 4.9, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H'}


Sat, 26 Sep 2026 11:30:00 +0000

Type Values Removed Values Added
First Time appeared Rabbitmq
Rabbitmq rabbitmq-server
Vendors & Products Rabbitmq
Rabbitmq rabbitmq-server

Fri, 25 Sep 2026 21:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 25 Sep 2026 16:45:00 +0000

Type Values Removed Values Added
Description RabbitMQ is a messaging and streaming broker. From 4.0.0 until 4.0.22 and 4.1.14 and 4.2.7, Admin-only atom exhaustion: PUT /api/users tags list. settags/2 maps rabbitdatacoercion:toatom/1 over the user's tags list. The 20 MB management body limit fits ~3-4M short tag strings. An administrator can crash the node in a single request by creating a user (or importing definitions) with ~1M unique tag administrator. This issue is fixed in versions 4.0.22 and 4.1.14 and 4.2.7.
Title RabbitMQ: Admin-only atom exhaustion: PUT /api/users tags list
Weaknesses CWE-400
References
Metrics cvssV4_0

{'score': 6.9, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2026-09-25T16:29:13.662Z

Updated: 2026-09-25T19:55:13.807Z

Reserved: 2026-07-28T19:50:39.437Z

Link: CVE-2026-67226

cve-icon Vulnrichment

Updated: 2026-09-25T19:54:50.562Z

cve-icon NVD

Status : Analyzed

Published: 2026-09-25T17:17:11.000

Modified: 2026-10-20T13:36:07.600

Link: CVE-2026-67226

cve-icon Redhat

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