All vulnerabilities
CVE-2026-67229GHSA-ggrw-qm45-hwpv

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

rabbitmq rabbitmq-server
Open in ThreatlineRecord JSON
CVSS
6.9Medium
ExploitationPublic exploit codeCISA's assessment says proof of concept code is public, assessed 24 Sep 2026. Not in the KEV catalogCISA via CVE List
Exploit odds (EPSS)0.32%Chance of exploitation activity in the next 30 days, higher than 23% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed inNone listedNo source names a fixed version. Check the vendor advisory below
Published23 Sep 2026Updated 24 Sep 2026CVE List

What fixes it

No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.

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.

Text from CVE List

Affected versions 4

  • rabbitmq-serveraffected: >= 3.13.0, < 3.13.15CVE List
  • rabbitmq-serveraffected: >= 4.0.0, < 4.0.20CVE List
  • rabbitmq-serveraffected: >= 4.1.0, < 4.1.11CVE List
  • rabbitmq-serveraffected: >= 4.2.0, < 4.2.6CVE List

References 3