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[USN-8869-1] RabbitMQ Server vulnerability

Posted on 06 October 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8869-1
October 06, 2026

rabbitmq-server vulnerability
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 26.04 LTS
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS

Summary:

RabbitMQ Server could be made to crash if it received specially crafted
network traffic.

Software Description:
- rabbitmq-server: AMQP server written in Erlang

Details:

It was discovered that RabbitMQ Server incorrectly handled certain HTTP/2
headers. An attacker could possibly use this issue to cause a denial of
service via memory exhaustion.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 26.04 LTS
rabbitmq-server 4.0.5-10ubuntu5.1

Ubuntu 24.04 LTS
rabbitmq-server 3.12.1-1ubuntu1.6

Ubuntu 22.04 LTS
rabbitmq-server 3.9.27-0ubuntu0.5

Ubuntu 20.04 LTS
rabbitmq-server 3.8.3-0ubuntu0.3+esm1
Available with Ubuntu Pro

After a standard system update you need to restart RabbitMQ Server to make
all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-8869-1
CVE-2026-59248

Package Information:
https://launchpad.net/ubuntu/+source/rabbitmq-server/4.0.5-10ubuntu5.1
https://launchpad.net/ubuntu/+source/rabbitmq-server/3.12.1-1ubuntu1.6
https://launchpad.net/ubuntu/+source/rabbitmq-server/3.9.27-0ubuntu0.5

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