CVE-2026-67227CWE-400denial-of-service

CVE-2026-67227

Medium · published September 25, 2026

CVSS v3.1
4.9
EPSS
0%
Percentile
30.6
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
4.9 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
5.9 · 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
EPSS
0.00378 · 30.6th percentile
Weakness
CWE-400 · Uncontrolled Resource Consumption
Published
2026-09-25T21:17Z
Affected products (4)
ProductVersionsFixed in
broadcom/rabbitmq_server≥ 4.0.0, < 4.0.224.0.22
broadcom/rabbitmq_server≥ 4.1.0, < 4.1.144.1.14
broadcom/rabbitmq_server≥ 4.2.0, < 4.2.74.2.7
broadcom/rabbitmq_server≥ 4.3.0, < 4.3.14.3.1
References (5)
https://github.com/rabbitmq/rabbitmq-server/commit/8fbe6d8112427e85fb9a9206b3eb6e9a3ddd3e39 · [email protected]https://github.com/rabbitmq/rabbitmq-server/commit/fc591e7ee27a29657ca960930acefd3e4217e007 · [email protected]https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.7 · [email protected]https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.1 · [email protected]https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-q7x8-97rh-cr24 · [email protected]
EPSS history
Timeline
  • 27 SEP 03:27Z
    EPSS moved — → 0%
    epss
  • 25 SEP 16:31Z
    RabbitMQ: Atom exhaustion: to_atom on global-parameter :name
    cvelistv5