CVE-2026-67227 (GCVE-0-2026-67227)

Vulnerability from cvelistv5 – Published: 2026-09-25 16:31 – Updated: 2026-09-25 17:48
VLAI
Title
RabbitMQ: Atom exhaustion: to_atom on global-parameter :name
Summary
RabbitMQ is a messaging and streaming broker. From 4.0.0 until 4.0.22 and 4.1.14 and 4.2.7 and 4.3.1, Atom exhaustion: toatom on global-parameter :name. resourceexists/2 (and the PUT/DELETE handlers) call rabbitdatacoercion:toatom/1 on the :name URL path segment. toatom/1 uses binarytoatom/2 (unsafe). The endpoint requires policymaker (not management, but below A user with the policymaker tag can crash the node by exhausting the atom table via repeated requests to /api/global-parameters/:name with unique :name Management plugin enabled policymaker tag ~1M HTTP. This issue is fixed in versions 4.0.22 and 4.1.14 and 4.2.7 and 4.3.1.
Severity
5.9 (Medium)
CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-25 17:47 UTC
CWE
  • CWE-400 - Uncontrolled Resource Consumption
Assigner
References
Impacted products
Vendor Product Version
rabbitmq rabbitmq-server Affected: >= 4.0.0, < 4.0.22
Affected: >= 4.1.0, < 4.1.14
Affected: >= 4.2.0, < 4.2.7
Affected: >= 4.3.0, < 4.3.1
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