CVE-2026-57211: Broadcom Rabbitmq Server

Critical severity, CVSS 10.0. EPSS: 0.6% chance of exploitation in the next 30 days.

RabbitMQ is a messaging and streaming broker. Prior to 4.1.11 and 4.2.6 on Windows, the RabbitMQ management plugin static file handler rabbit_mgmt_wm_static can pass URL-encoded backslashes to erl_prim_loader:read_file_info before path validation when multiple management extension plugins are enabled, causing outbound DNS and SMB requests to attacker-controlled UNC paths. This issue is fixed in versions 4.1.11 and 4.2.6.

Affected products

• Broadcom Rabbitmq Server: from 4.1.0, before 4.2.6 (fixed in 4.2.6)

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