========================================================================== Ubuntu Security Notice USN-8624-1 July 29, 2026
ruby-sinatra vulnerability
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
Summary:
Sinatra could be made to crash if it received specially crafted network
traffic.
Software Description:
- ruby-sinatra: Ruby web-development dressed in a DSL
Details:
It was discovered that Sinatra did not properly handle header parsing,
causing ETag generation to hang when given specific input. A remote
attacker could possibly use this issue to cause a denial of service.
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 22.04 LTS
ruby-sinatra 2.0.8.1-2+deb11u1ubuntu0.1~esm1
Available with Ubuntu Pro
Ubuntu 20.04 LTS
ruby-sinatra 2.0.8.1-1ubuntu0.1~esm3
Available with Ubuntu Pro
Ubuntu 18.04 LTS
ruby-sinatra 1.4.8-1ubuntu0.1~esm3
Available with Ubuntu Pro
Ubuntu 16.04 LTS
ruby-sinatra 1.4.7-3ubuntu0.1~esm3
Available with Ubuntu Pro
After a standard system update you need to restart any applications that
use ruby-sinatra to make all the necessary changes.
References:
https://ubuntu.com/security/notices/USN-8624-1
CVE-2025-61921
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