Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Broadcom | Rabbitmq Server | >= 3.13.0, < 3.13.15 |
Related Weaknesses (CWE)
References
- https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.6Release Notes
- https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-85jr-6rr2-jVendor Advisory
FAQ
What is CVE-2026-67222?
CVE-2026-67222 is a vulnerability with a CVSS score of 6.5 (MEDIUM). 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_me...
How severe is CVE-2026-67222?
CVE-2026-67222 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-67222?
Check the references section above for vendor advisories and patch information. Affected products include: Broadcom Rabbitmq Server.