Is CVE-2026-67232 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-67232 being exploited in the wild.

How severe is CVE-2026-67232?

Informational severity, published 23 September 2026.

Which products and versions are affected?

RabbitMQ before 3.13.15, 4.0.20, 4.1.11, 4.2.6, and 4.3.0.

Is there a fix for CVE-2026-67232?

A patch was published on 2026-04-23: Patches released for versions 3.13.15, 4.0.20, 4.1.11, 4.2.6, and 4.3.0 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-67232 attacked?

It is attacked over the network, in a hosted service.

Am I affected by CVE-2026-67232?

Check whether you run RabbitMQ at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-67232: RabbitMQ zlib bomb denial of service in Web-MQTT WebSocket

CVE-2026-67232 · Severity: info · Published 2026-09-23

RabbitMQ is a messaging broker used to route messages between applications. The Web-MQTT plugin enables browser clients to connect via WebSocket, but prior to the fixed versions, it did not limit decompressed frame sizes. An unauthenticated attacker can send a highly compressed WebSocket frame (a few kilobytes on the wire) that decompresses to gigabytes, crashing the RabbitMQ node without needing to log in or send any valid credentials.

Technologies: RabbitMQ. Vendors: RabbitMQ.

Quick answers

Is CVE-2026-67232 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-67232 being exploited in the wild.
How severe is CVE-2026-67232?: Informational severity, published 23 September 2026.
Which products and versions are affected?: RabbitMQ before 3.13.15, 4.0.20, 4.1.11, 4.2.6, and 4.3.0.
Is there a fix for CVE-2026-67232?: A patch was published on 2026-04-23: Patches released for versions 3.13.15, 4.0.20, 4.1.11, 4.2.6, and 4.3.0 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-67232 attacked?: It is attacked over the network, in a hosted service.
Am I affected by CVE-2026-67232?: Check whether you run RabbitMQ at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

The vulnerability is a zlib bomb denial of service in RabbitMQ's Web-MQTT WebSocket handler. The cowboy WebSocket configuration enables RFC 7692 permessage-deflate compression but does not set max_frame_size, allowing cowlib's cow_ws:parse_payload/9 to decompress frames to unlimited size. An unauthenticated attacker with network access to the WebSocket port can send a single compressed frame that inflates to gigabytes in memory before the MQTT CONNECT packet is ever processed, crashing the connection process. The fix adds a default max_frame_size limit that is enforced before authentication.

Affected products

RabbitMQ RabbitMQ before 3.13.15, 4.0.20, 4.1.11, 4.2.6, and 4.3.0

Timeline

2026-09-23: disclosed
2026-04-23: patched: Patches released for versions 3.13.15, 4.0.20, 4.1.11, 4.2.6, and 4.3.0

References

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