A Puma security update has been released for Ubuntu Linux 23.04.

[USN-6399-1] Puma vulnerability

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Ubuntu Security Notice USN-6399-1
September 27, 2023

puma vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 23.04

Summary:

Puma could allow HTTP Request Smuggling attacks.

Software Description:
- puma: threaded HTTP 1.1 server for Ruby/Rack applications

Details:

It was discovered that Puma incorrectly handled parsing certain headers. A
remote attacker could possibly use this issue to perform an HTTP request
Smuggling attack.

Update instructions:

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

Ubuntu 23.04:
puma 5.6.5-3ubuntu1.1

In general, a standard system update will make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-6399-1
CVE-2023-40175

Package Information:
https://launchpad.net/ubuntu/+source/puma/5.6.5-3ubuntu1.1