CVE-2026-67226CWE-400denial-of-service

CVE-2026-67226

Medium · published September 25, 2026

CVSS v3.1
4.9
EPSS
0%
Percentile
31.8
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, Admin-only atom exhaustion: PUT /api/users tags list. settags/2 maps rabbitdatacoercion:toatom/1 over the user's tags list. The 20 MB management body limit fits ~3-4M short tag strings. An administrator can crash the node in a single request by creating a user (or importing definitions) with ~1M unique tag administrator. This issue is fixed in versions 4.0.22 and 4.1.14 and 4.2.7.

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
6.9 · CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
EPSS
0.00389 · 31.8th percentile
Weakness
CWE-400 · Uncontrolled Resource Consumption
Published
2026-09-25T21:17Z
Affected products (3)
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
References (4)
https://github.com/rabbitmq/rabbitmq-server/commit/86601c5a6d1c7e41060e3dbd165c88bdc91266ee · [email protected]https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.7 · [email protected]https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-34c7-r8w9-5wv8 · [email protected]https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-34c7-r8w9-5wv8 · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 27 SEP 03:27Z
    EPSS moved — → 0%
    epss
  • 25 SEP 16:29Z
    RabbitMQ: Admin-only atom exhaustion: PUT /api/users tags list
    cvelistv5