Rabbitmq server: RabbitMQ is a messaging and streaming broker. (CVE-2026-67222)
Description
CVE-2026-67222 is a vulnerability in RabbitMQ server versions from 3.13.0 up to but not including 3.13.15, 4.0.20, 4.1.11, and 4.2.6. It involves the improper handling of the auth_mechanism value in the Shovel or Federation plugins, which can cause permanent consumption of Erlang VM atoms and lead to a node crash. Exploitation requires specific plugin usage and permissions. The issue has been fixed in the stated versions.
CVSS v3.1
Score 6.5medium
Affected software
pkg:deb/ubuntu/rabbitmq-server?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/rabbitmq-server?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/rabbitmq-server?arch=source&distro=esm-infra/focalpkg:deb/ubuntu/rabbitmq-server?arch=source&distro=jammypkg:deb/ubuntu/rabbitmq-server?arch=source&distro=noblepkg:deb/ubuntu/rabbitmq-server?arch=source&distro=resoluteRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
RabbitMQ versions 3.13.0 through 3.13.14, 4.0.20, 4.1.11, and 4.2.6 contain a vulnerability where the mechanisms/1 function applies list_to_atom/1 to every colon-delimited token in an attacker-controlled auth_mechanism value. This causes permanent consumption of Erlang VM atoms, which can crash the node when a large request is made. Exploitation requires the Shovel or Federation plugin to be enabled and the attacker to have the policymaker tag to set auth_mechanism. The vulnerability is resolved in versions 3.13.15, 4.0.20, 4.1.11, and 4.2.6.
Potential Impact
An attacker with the ability to set the auth_mechanism value via the Shovel or Federation plugin and possessing the policymaker tag can cause a denial of service by crashing the RabbitMQ node through exhaustion of Erlang VM atoms. There is no impact on confidentiality or integrity reported. The CVSS 3.1 score is 6.5 (medium severity), reflecting a network attack vector with low complexity and no user interaction required, but requiring privileges.
Mitigation Recommendations
This vulnerability is fixed in RabbitMQ versions 3.13.15, 4.0.20, 4.1.11, and 4.2.6. Users should upgrade to these or later versions to remediate the issue. No other mitigation steps are indicated by the vendor advisory.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-67222
- Osv Schema Version
- 1.7.0
- Ecosystems
- ["Ubuntu:Pro:16.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:22.04:LTS","Ubuntu:24.04:LTS","Ubuntu:26.04:LTS"]
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ad3f5ac2cdf04f6566627ff
Added to database: 10/17/2026, 22:24:44 UTC
Last enriched: 10/18/2026, 00:04:42 UTC
Last updated: 10/18/2026, 00:04:42 UTC
Views: 2
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