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.

• CWE-770

• https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.6Release Notes
• https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.0Release Notes
• https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-wg79-5449-m728Vendor Advisory

Published

Sep 23, 2026

Last Modified

Oct 19, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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