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CVE-2026-66080 Details

Description

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.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:4.9 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.6	[email protected]	Release Notes
https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.0	[email protected]	Release Notes
https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-wg79-5449-m728	[email protected]	Vendor Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-770	Allocation of Resources Without Limits or Throttling	[email protected]

Affected Products

Product	Versions
broadcom rabbitmq server	>= 4.1.0, < 4.1.11 >= 4.2.0, < 4.2.6
CPE cpe:2.3:a:broadcom:rabbitmq_server:::::::: Remediation No remediation found in references.

Change History

3 change records found show changes

Date	Action	Recorded By
Oct 19, 2026	Initial Analysis	[email protected]
Sep 24, 2026	CVE Modified	CISA-ADP
Sep 23, 2026	New CVE Received	[email protected]