RabbitMQ up to 4.1.10/4.2.5 Stream Management validate_partitions allocation of resources

Summaryinfo

A vulnerability has been found in RabbitMQ up to 4.1.10/4.2.5 and classified as problematic. Affected by this issue is the function validate_partitions of the component Stream Management. The manipulation leads to allocation of resources. This vulnerability is listed as CVE-2026-66080. The attack may be initiated remotely. There is no available exploit. The affected component should be upgraded.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in RabbitMQ up to 4.1.10/4.2.5. This issue affects the function validate_partitions of the component Stream Management. The manipulation with an unknown input leads to a allocation of resources vulnerability. Using CWE to declare the problem leads to CWE-770. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor. Impacted is availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-66080 since 07/24/2026. The exploitation is known to be easy. The attack may be initiated remotely. Additional levels of successful authentication are necessary for exploitation. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1499 according to MITRE ATT&CK.

Upgrading to version 4.1.11, 4.2.6 or 4.3.0 eliminates this vulnerability.

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Productinfo

Name

• RabbitMQ

Version

• 4.1.0
• 4.1.1
• 4.1.2
• 4.1.3
• 4.1.4
• 4.1.5
• 4.1.6
• 4.1.7
• 4.1.8
• 4.1.9
• 4.1.10
• 4.2.0
• 4.2.1
• 4.2.2
• 4.2.3
• 4.2.4
• 4.2.5

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