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Ubuntu 25.04 WEBrick Severe HTTP Request Smuggling USN-7709-1 CVE-2025-6442

ubuntu
Calendar Grey August 21, 2025
Dist Ubuntu Esm H88
The HTTP server WEBrick on Ubuntu has critical vulnerabilities that allow for HTTP request smuggling; updates are now available for impacted releases.
WEBrick could allow an HTTP request smuggling attack.

Summary

WEBrick could allow an HTTP request smuggling attack.

Software Description:

- ruby-webrick: HTTP server toolkit in Ruby

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.

Topics%20covered

Topics Covered

security advisory critical remote attack Ubuntu HTTP ruby-webrick

Update Instructions

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

Ubuntu 25.04
  ruby-webrick                    1.8.1-1ubuntu1.1

Ubuntu 24.04 LTS
  ruby-webrick                    1.8.1-1ubuntu0.2

Ubuntu 22.04 LTS
  ruby-webrick                    1.7.0-3ubuntu0.2

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

References

https://ubuntu.com/security/notices/USN-7709-1

CVE-2025-6442

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-7709-1

Topics%20covered

Topics Covered

security advisory critical remote attack Ubuntu HTTP ruby-webrick

Package Information

https://launchpad.net/ubuntu/+source/ruby-webrick/1.8.1-1ubuntu1.1
https://launchpad.net/ubuntu/+source/ruby-webrick/1.8.1-1ubuntu0.2

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