RabbitMQ: Admin-only atom exhaustion: PUT /api/users tags list
CVE-2026-67226 is fixed in rabbitmq-server on 1 platform by DEBIAN-CVE-2026-67226 (version 4.3.0-2), released September 26, 2026. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| rabbitmq-server · Debian 14 | 4.3.0-2 | DEBIAN-CVE-2026-67226 | Sep 26, 2026 |
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