CVE-2026-57216

CRITICAL CVSS 3.1: 10.0 EPSS 0.50%
Updated Jul 14, 2026
Broadcom
Parameter Value
CVSS 10.0 (CRITICAL)
Affected Versions 3.13.0 — 4.2.6
Fixed In 4.2.6
Type CWE-287 (Improper Authentication)
Vendor Broadcom
Public PoC No

RabbitMQ is a messaging and streaming broker. Prior to 3.13.15, 4.0.20, 4.1.11, and 4.2.6, AMQP 0-9-1, AMQP 1.0, and Stream Protocol authentication can allow a loopback-restricted user such as guest to connect remotely when traffic is accepted through a trusted PROXY-protocol path and the backend listener is loopback-bound because the loopback check uses the listener-side socket address instead of the real client source. This issue is fixed in versions 3.13.15, 4.0.20, 4.1.11, and 4.2.6.

Attack Parameters

Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed

Impact Assessment

Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service

CVSS Vector v3.1

Vulnerable Products 1

Configuration From (including) Up to (excluding)
Broadcom Rabbitmq_Server
cpe:2.3:a:broadcom:rabbitmq_server:*:*:*:*:*:*:*:*
3.13.0 4.2.6