CVE-2026-67229

RabbitMQ: Admin-only atom exhaustion: atomize_keys on vhost metadata

State: Published
Severity: 6.9 Medium
Published: Sep 23, 2026
Updated: Sep 24, 2026
Reserved: Jul 28, 2026

Description

RabbitMQ is a messaging and streaming broker. Prior to versions 3.13.15, 4.0.20, 4.1.11, 4.2.6, and 4.3.0, add_vhost/2 calls rabbit_data_coercion:atomize_keys/1 (the unsafe variant using binary_to_atom) on the vhost metadata map. The 20 MB management body limit fits ~1M+ short keys. Admin-only. An administrator importing a crafted definitions file can crash the node in a single request: a vhosts entry with ~1M unique metadata keys exhausts the atom table during import. Preconditions include administrator tag. This issue is fixed in versions 3.13.15, 4.0.20, 4.1.11, 4.2.6, and 4.3.0.

Scores

CVSS	Score	Vector	Source
4.0	6.9 Medium	CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N	GitHub_M

Weaknesses

CWE-400 Uncontrolled Resource Consumption

Affected Products

Product	Versions
rabbitmq-serverrabbitmq	>= 3.13.0, < 3.13.15Affected >= 4.0.0, < 4.0.20Affected >= 4.1.0, < 4.1.11Affected >= 4.2.0, < 4.2.6Affected

References

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