USN-7784-1: Rack vulnerability

Publication date

29 September 2025

Overview

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


Packages

  • 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.

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

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

Learn more about how to get the fixes.

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

Ubuntu Release Package Version
25.04 plucky ruby-rack –  2.2.7-1.1ubuntu0.25.04.3
24.04 noble ruby-rack –  2.2.7-1ubuntu0.4

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