medium4.9
CVE-2026-67226
RabbitMQ is a messaging and streaming broker.
Impact
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.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Broadcom | Rabbitmq Server | from 4.0.0 before 4.0.22 from 4.1.0 before 4.1.14 from 4.2.0 before 4.2.7 |