CVE-2026-67229
RabbitMQ: Admin-only atom exhaustion: atomize_keys on vhost metadata
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-400 |
| Vendor | rabbitmq |
| Product | rabbitmq-server |
| Published | Sep 23, 2026 |
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Affected Versions
rabbitmq / rabbitmq-server
>= 3.13.0, < 3.13.15 >= 4.0.0, < 4.0.20 >= 4.1.0, < 4.1.11 >= 4.2.0, < 4.2.6