CVE-2026-66080

RabbitMQ is a messaging and streaming broker. Prior to versions 4.1.11, 4.2.6, and 4.3.0, validate_partitions only checks that the requested partition count is at least 1, with no upper bound. A large count such as lists:seq(0, 500000000) allocates roughly 8GB. Preconditions include The rabbitmq_stream_management plugin must be enabled. The caller needs the management tag and access to the target vhost.. This issue is fixed in versions 4.1.11, 4.2.6, and 4.3.0.

CVSS v3 4.9 MEDIUM

4.9^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 1.2 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required HIGH

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.6	Release Notes
https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.0	Release Notes
https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-wg79-5449-m728	Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:broadcom:rabbitmq_server::::::::
	cpe:2.3:a:broadcom:rabbitmq_server::::::::

History

19 Oct 2026, 20:37

Type	Values Removed	Values Added
First Time		Broadcom rabbitmq Server Broadcom
CPE		cpe:2.3:a:broadcom:rabbitmq_server::::::::
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 4.9
References	~~() https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.6 -~~	() https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.6 - Release Notes
References	~~() https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.0 -~~	() https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.0 - Release Notes
References	~~() https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-wg79-5449-m728 -~~	() https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-wg79-5449-m728 - Vendor Advisory

23 Sep 2026, 21:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-09-23 21:16

Updated : 2026-10-19 20:37

NVD link : CVE-2026-66080

Mitre link : CVE-2026-66080

CVE.ORG link : CVE-2026-66080

JSON object : View

Products Affected

broadcom

rabbitmq_server

CWE

CWE-770

Allocation of Resources Without Limits or Throttling

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