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CVE-2026-67232

7.5, high

RabbitMQ is a messaging and streaming broker

NVD (opens in a new tab) CVE.org (opens in a new tab)
CVSS
7.5, high high CVSS v3.1
EPSS, next 30 days
0.4% higher than 29% of scored CVEs
Exploitation
No public evidence
Published
23 Sept 202627 days ago

Description

RabbitMQ is a messaging and streaming broker. Prior to versions 3.13.15, 4.0.20, 4.1.11, 4.2.6, and 4.3.0, The cowboy WebSocket options at line 117 set compress => true, enabling RFC 7692 permessage-deflate negotiation. The handler does not set max_frame_size, so cowboy's default of infinity applies. cowlib's cow_ws:parse_payload/9 calls zlib:inflate/2 on the compressed payload with no output-size limit. An attacker can negotiate permessage-deflate during the WebSocket upgrade and send a frame containing a zlib bomb (e.g. 50 KB → 5 GB). Decompression occurs in the connection process before websocket_handle/2 ever sees the MQTT bytes. An unauthenticated attacker can crash a RabbitMQ node running the Web-MQTT plugin by sending a single highly-compressed WebSocket frame (a few KB on the wire) that inflates to gigabytes in memory. The cowboy WebSocket handler decompresses the entire frame before the MQTT CONNECT packet is processed, so no credentials are required. Preconditions include rabbitmq_web_mqtt plugin enabled (not default, but common for browser clients) Network reachability to port 15675/15676 No authentication required. This issue is fixed in versions 3.13.15, 4.0.20, 4.1.11, 4.2.6, and 4.3.0.

Details

Vendor
Rabbitmq
Product
rabbitmq-server
Weakness
CWE-409 (opens in a new tab)
Status
Analyzed
Updated
19 Oct 2026
Assigner
security-advisories@github.com

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References 3

Advisories 1

Other references 2

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other Rabbitmq CVEs

Every Rabbitmq CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2026-106121 The RabbitMQ Java client library allows Java and JVM-based applications to connect to and interact with RabbitMQ nodes EPSS 0.5% 7.5, high
  • CVE-2026-106122 The RabbitMQ Java client library allows Java and JVM-based applications to connect to and interact with RabbitMQ nodes EPSS 0.5% 7.5, high
  • CVE-2026-67410 rabbitmq-server Exposure of Sensitive Information Vulnerability EPSS 0.4% 7.1, high
  • CVE-2026-67411 rabbitmq-server Incorrect Authorization Vulnerability EPSS 0.3% 7.1, high
  • CVE-2026-67412 rabbitmq-server Missing Authorization Vulnerability EPSS 0.3% 7.1, high
  • CVE-2026-67223 RabbitMQ is a messaging and streaming broker EPSS 0.4% 7.1, high
  • CVE-2026-67407 rabbitmq-server Missing Authorization Vulnerability EPSS 0.2% 7.1, high
  • CVE-2026-67233 rabbitmq-server Missing Authorization Vulnerability EPSS 0.3% 7.1, high

Beyond this page

Is CVE-2026-67232 in your network?

This page tells you how dangerous CVE-2026-67232 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

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Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 20 Oct 2026, not the live upstream state.