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[USN-8624-1] Sinatra vulnerability

Posted on 30 July 2026
Ubuntu Security

==========================================================================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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