Bug 2541518 (CVE-2026-67226) - CVE-2026-67226 rabbitmq-server: rabbitmq-server: Denial of Service via Erlang atom exhaustion in user tag management
Summary: CVE-2026-67226 rabbitmq-server: rabbitmq-server: Denial of Service via Erlang...
Keywords:
Status: NEW
Alias: CVE-2026-67226
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-09-25 16:51 UTC by OSIDB Bzimport
Modified: 2026-10-16 21:24 UTC (History)
7 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments (Terms of Use)

Description OSIDB Bzimport 2026-09-25 16:51:58 UTC 
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.
Note You need to log in before you can comment on or make changes to this bug.