CVE-2026-57217: Broadcom Rabbitmq Server

Medium severity, CVSS 6.5. EPSS: 0.4% chance of exploitation in the next 30 days.

RabbitMQ is a messaging and streaming broker. Prior to 3.13.15, 4.0.21, 4.1.11, and 4.2.6, RabbitMQ topic authorization can allow restricted topic writes and binds during metadata-store failures because topic-permission lookup errors from Khepri can collapse to undefined, which the internal backend treats as allow. This issue is fixed in versions 3.13.15, 4.0.21, 4.1.11, and 4.2.6.

Affected products

• Broadcom Rabbitmq Server: from 3.13.0, before 4.2.6 (fixed in 4.2.6)

Published 2026-07-10. Last modified 2026-07-13.