CVE-2026-67222
Medium
Description
RabbitMQ is a messaging and streaming broker. From 3.13.0 until 3.13.15, 4.0.20, 4.1.11, and 4.2.6, mechanisms/1 applied list_to_atom/1 to every colon-delimited token in an attacker-controlled auth_mechanism value, permanently consuming Erlang VM atoms and allowing the node to be crashed with a large request. Exploitation requires the Shovel or Federation plugin to be in use, and setting auth_mechanism requires the policymaker tag. This issue is fixed in versions 3.13.15, 4.0.20, 4.1.11, and 4.2.6.
SeverityMedium
CVSS6.5
Exploit probability—
Product
Broadcom Rabbitmq Server
PublishedSep 25, 2026
First seenSep 25, 2026
Weakness typeCWE-400Uncontrolled resource consumption
How to fix
Update
- broadcom rabbitmq_server3.13.15, 4.0.20, 4.1.11, 4.2.6 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| broadcom rabbitmq_server | 3.13.0 ≤ v < 3.13.15, 4.0.0 ≤ v < 4.0.20, 4.1.0 ≤ v < 4.1.11, 4.2.0 ≤ v < 4.2.6 | 3.13.15, 4.0.20, 4.1.11, 4.2.6 |
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