CVE-2026-67226: CWE-400: Uncontrolled Resource Consumption in rabbitmq rabbitmq-server
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.
AI Analysis
Technical Summary
RabbitMQ server versions 4.0.0 to before 4.0.22, 4.1.0 to before 4.1.14, and 4.2.0 to before 4.2.7 contain a CWE-400 uncontrolled resource consumption vulnerability. The flaw arises from the management API's PUT /api/users endpoint, which maps rabbitdatacoercion:toatom/1 over the user's tags list. The management body limit of 20 MB can accommodate approximately 3-4 million short tag strings. An administrator can exploit this by creating a user or importing definitions with around one million unique tags, causing atom exhaustion and crashing the RabbitMQ node. The vulnerability has a CVSS 4.0 base score of 6.9 (medium severity).
Potential Impact
An administrator with privileges can cause a denial of service by crashing the RabbitMQ node through a single crafted request containing a large number of unique tags. This leads to uncontrolled resource consumption (atom exhaustion), resulting in service disruption.
Mitigation Recommendations
This vulnerability is fixed in rabbitmq-server versions 4.0.22, 4.1.14, and 4.2.7. Users should upgrade to these or later versions to remediate the issue. No other mitigation or workaround is indicated.
CVE-2026-67226: CWE-400: Uncontrolled Resource Consumption in rabbitmq rabbitmq-server
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.
CVSS v4.0
Score 6.9medium
Affected software
rabbitmq
rabbitmq-server
pkg:github/rabbitmq/rabbitmq-serverRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
RabbitMQ server versions 4.0.0 to before 4.0.22, 4.1.0 to before 4.1.14, and 4.2.0 to before 4.2.7 contain a CWE-400 uncontrolled resource consumption vulnerability. The flaw arises from the management API's PUT /api/users endpoint, which maps rabbitdatacoercion:toatom/1 over the user's tags list. The management body limit of 20 MB can accommodate approximately 3-4 million short tag strings. An administrator can exploit this by creating a user or importing definitions with around one million unique tags, causing atom exhaustion and crashing the RabbitMQ node. The vulnerability has a CVSS 4.0 base score of 6.9 (medium severity).
Potential Impact
An administrator with privileges can cause a denial of service by crashing the RabbitMQ node through a single crafted request containing a large number of unique tags. This leads to uncontrolled resource consumption (atom exhaustion), resulting in service disruption.
Mitigation Recommendations
This vulnerability is fixed in rabbitmq-server versions 4.0.22, 4.1.14, and 4.2.7. Users should upgrade to these or later versions to remediate the issue. No other mitigation or workaround is indicated.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-07-28T19:50:39.437Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6ab6a5d4f7a7c5410605563b
Added to database: 09/25/2026, 16:48:20 UTC
Last enriched: 09/25/2026, 17:03:42 UTC
Last updated: 09/26/2026, 03:44:34 UTC
Views: 13
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