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[USN-7784-1] Rack vulnerability

Posted on 29 September 2025
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-7784-1
September 29, 2025

ruby-rack vulnerability
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 25.04
- Ubuntu 24.04 LTS

Summary:

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

Software Description:
- ruby-rack: modular Ruby webserver interface

Details:

It was discovered that Rack incorrectly handled limiting the amount of
parameters. An attacker could possibly use this issue to bypass the
params_limit value, leading to a denial of service.

Update instructions:

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

Ubuntu 25.04
ruby-rack 2.2.7-1.1ubuntu0.25.04.3

Ubuntu 24.04 LTS
ruby-rack 2.2.7-1ubuntu0.4

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

References:
https://ubuntu.com/security/notices/USN-7784-1
CVE-2025-59830

Package Information:
https://launchpad.net/ubuntu/+source/ruby-rack/2.2.7-1.1ubuntu0.25.04.3
https://launchpad.net/ubuntu/+source/ruby-rack/2.2.7-1ubuntu0.4

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