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CVE-2026-67227

RabbitMQ: Atom exhaustion: to_atom on global-parameter :name

MEDIUM
4.9
CVSS Score
Published: September 25, 2026 at 04:31 PM UTC
Updated: October 20, 2026 at 01:35 PM UTC
2 products affected across 2 vendorsRabbitmq ServerRabbitmq Server

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Severity
MEDIUM4.9
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Rabbitmq Server· Broadcom
95%
4.0.0 ≤ v < 4.0.224.1.0 ≤ v < 4.1.144.2.0 ≤ v < 4.2.74.3.0 ≤ v < 4.3.1
Rabbitmq Server· Rabbitmq
90%
Affected range stops below 4.0.22, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.1.14, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.2.7, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.3.1, so it looks safe — our inference, not a vendor statement

References (5)

x_refsource_CONFIRMVendor Advisory
Source: cverecord
https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-q7x8-97rh-cr24
x_refsource_MISCPatch
Source: cverecord
https://github.com/rabbitmq/rabbitmq-server/commit/8fbe6d8112427e85fb9a9206b3eb6e9a3ddd3e39
x_refsource_MISCPatch
Source: cverecord
https://github.com/rabbitmq/rabbitmq-server/commit/fc591e7ee27a29657ca960930acefd3e4217e007
x_refsource_MISCRelease NotesPatch
Source: cverecord
https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.7
x_refsource_MISCRelease NotesPatch
Source: cverecord
https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.1

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

4.9MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-400

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