Bug 2539770 (CVE-2026-67229) - CVE-2026-67229 RabbitMQ: RabbitMQ: Denial of Service via admin-only atom exhaustion from crafted vhost metadata
Summary: CVE-2026-67229 RabbitMQ: RabbitMQ: Denial of Service via admin-only atom exha...
Keywords:
Status: NEW
Alias: CVE-2026-67229
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
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URL:
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Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-09-23 20:41 UTC by OSIDB Bzimport
Modified: 2026-09-24 06:32 UTC (History)
0 users

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Description OSIDB Bzimport 2026-09-23 20:41:34 UTC 
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.
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