---
id: CVE-2026-57216
title: RabbitMQ is a messaging and streaming broker
summary: >-
  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 ac…
severity: medium
cvss: 6.8
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N'
cwe:
  - CWE-287
published: '2026-07-10'
updated: '2026-07-10'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-57216'
references:
  - url: >-
      https://github.com/rabbitmq/rabbitmq-server/commit/7273c9eb6920abcde17b892dbe97ccaf906ead47
    label: security-advisories@github.com
  - url: >-
      https://github.com/rabbitmq/rabbitmq-server/commit/9f8c39fcf0acbc43080ee7017a62a02832114112
    label: security-advisories@github.com
  - url: 'https://github.com/rabbitmq/rabbitmq-server/pull/15936'
    label: security-advisories@github.com
  - url: 'https://github.com/rabbitmq/rabbitmq-server/pull/15940'
    label: security-advisories@github.com
  - url: 'https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.6'
    label: security-advisories@github.com
  - url: >-
      https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-36m6-588r-vqcw
    label: security-advisories@github.com
tags:
  - nvd
epss: 0.00887
epssPercentile: 0.5752
ingestedAt: '2026-07-11T20:15:27.265Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.