USN-7709-1: WEBrick vulnerability

Publication date

21 August 2025

Overview

WEBrick could allow an HTTP request smuggling attack.


Packages

Details

It was discovered that WEBrick incorrectly parsed HTTP headers. In
configurations where WEBrick is placed behind an HTTP proxy, a remote
attacker could possibly use this issue to perform an HTTP Request Smuggling
attack.

It was discovered that WEBrick incorrectly parsed HTTP headers. In
configurations where WEBrick is placed behind an HTTP proxy, a remote
attacker could possibly use this issue to perform an HTTP Request Smuggling
attack.

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-webrick –  1.8.1-1ubuntu1.1
24.04 noble ruby-webrick –  1.8.1-1ubuntu0.2
22.04 jammy ruby-webrick –  1.7.0-3ubuntu0.2

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