---
id: CVE-2026-57220
title: RabbitMQ is a messaging and streaming broker
summary: >-
  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 una…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-770
published: '2026-07-10'
updated: '2026-07-10'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-57220'
references:
  - url: >-
      https://github.com/rabbitmq/rabbitmq-server/commit/595ec28fa1621b1f2c28124e4e0466a8ad963547
    label: security-advisories@github.com
  - url: >-
      https://github.com/rabbitmq/rabbitmq-server/commit/773a49c4921e8be990262a2d609c35916825679e
    label: security-advisories@github.com
  - url: 'https://github.com/rabbitmq/rabbitmq-server/pull/16171'
    label: security-advisories@github.com
  - url: 'https://github.com/rabbitmq/rabbitmq-server/pull/16173'
    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-f364-87q5-j35q
    label: security-advisories@github.com
tags:
  - nvd
epss: 0.00968
epssPercentile: 0.60187
ingestedAt: '2026-07-11T20:15:27.333Z'
---

## Overview

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.

## Remediation

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