Resource exhaustion in Broadcom Rabbitmq Server
CVE-2026-67226
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.
Vulnerability class: DoS (Denial of Service)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.9 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.004 (33.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 33rd percentile — 33.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.000
Affected products
- Broadcom Rabbitmq Server
- Rabbitmq Rabbitmq-Server — versions >= 4.0.0, < 4.0.22, >= 4.1.0, < 4.1.14, >= 4.2.0, < 4.2.7
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-67226?
- CVE-2026-67226 is a medium-severity vulnerability in Broadcom Rabbitmq Server, classified under Uncontrolled Resource Consumption. CVSS score: 4.9/10. Published 2026-09-25.
- How severe is CVE-2026-67226?
- Medium severity. CVSS v3 base score is 4.9 out of 10.