CVE-2026-57220: Broadcom Rabbitmq Server

High severity, CVSS 7.5. EPSS: 0.5% chance of exploitation in the next 30 days.

RabbitMQ is a messaging and streaming broker. Prior to 4.2.6, the RabbitMQ stream listener does not enforce the configured stream frame-size limit while assembling frames during authentication and before Tune negotiation, allowing an unauthenticated remote client to declare oversized frame lengths and consume broker memory in rabbit_stream_core. This issue is fixed in version 4.2.6.

Affected products

• Broadcom Rabbitmq Server: from 4.2.0, before 4.2.6 (fixed in 4.2.6)

Published 2026-07-10. Last modified 2026-10-09.