Medium severity4.9NVD Advisory· Published Sep 23, 2026· Updated Oct 19, 2026
CVE-2026-66080
CVE-2026-66080
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
3- Range: <4.1.11, <4.2.6, <4.3.0
- cpe:2.3:a:broadcom:rabbitmq_server:*:*:*:*:*:*:*:*Range: >=4.1.0,<4.1.11
Patches
Vulnerability mechanics
References
3- github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-wg79-5449-m728nvdVendor Advisory
- github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.6nvdRelease Notes
- github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.0nvdRelease Notes
News mentions
1- RabbitMQ Server: 22 Vulnerabilities Disclosed Together, Ranging from Critical to Low SeverityVypr Intelligence · Sep 23, 2026