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Ubuntu 22.04 LTS Sinatra Denial of Service Vulnern 2026-8624

Linuxsecurity •LinuxSecurity Advisories • July 30, 2026

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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.

Sinatra could be made to crash if it received specially crafted network

Software Description:

- ruby-sinatra: Ruby web-development dressed in a DSL

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.

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.

Ubuntu Security Notice USN-8624-1

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The full story

This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.

Denial of Service Vulnerability in Sinatra Affects Ubuntu Systems A vulnerability in the Sinatra web framework has been discovered, affecting multiple versions of ruby-sinatra across Ubuntu LTS releases. The flaw arises from improper header parsing, which can lead to ETag generation hanging when specific input is received. This could allow remote attackers to cause a denial of service by crashing applications that utilize Sinatra. The affected versions include ruby-sinatra 2.0.8.1-2+deb11u1ubuntu0.1 for Ubuntu 22.04 LTS, among others. Users are advised to update their systems to mitigate this risk. The vulnerability is documented under Ubuntu Security Notice USN-8624-1. After applying the updates, it is necessary to restart any applications using ruby-sinatra to implement the changes. The issue highlights the importance of regular system updates and privilege audits to limit potential compromises. 2 sources 58

Extracted Entities

Ubuntu 22.04 LTS Sinatra Denial of Service Vulnern 2026-8624

The full story

Extracted Entities

Attack Types (1)

Companies (1)

CWE Weaknesses (1)

IP Addresses (1)

MITRE ATT&CK (1)

Platforms (2)