Rack: Forwarded Header semicolon injection enables Host and Scheme spoofing

Summary Rack::Utils.forwardedvalues parses the RFC 7239 Forwarded header by splitting on semicolons before handling quoted-string values. Because quoted values may legally contain semicolons, a header such as: http Forwarded: for="127.0.0.1;host=evil.com;proto=https" can be interpreted by Rack as...

Unity Linux 20.1050a / 20.1060a / 20.1070a Security Update: pcs (UTSA-2026-005315)

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-005315 advisory. Rack is a modular Ruby web server interface. Carefully crafted Range headers can cause a server to respond with an unexpectedly large response. Responding with such...

Denial of Service (DoS)

Overview rack is a minimal, modular and adaptable interface for developing web applications in Ruby. By wrapping HTTP requests and responses in the simplest way possible, it unifies and distills the API for web servers, web frameworks, and software in between the so-called middleware into a singl...

SUSE CVE-2024-26141

Rack is a modular Ruby web server interface. Carefully crafted Range headers can cause a server to respond with an unexpectedly large response. Responding with such large responses could lead to a denial of service issue. Vulnerable applications will use the Rack::File middleware or the...

Ruby on Rails: DoS with crafted "Range" header

The vulnerability was discovered in the Active Storage component of Ruby on Rails. The vulnerability allowed an attacker to craft a "Range" header that could lead to a Denial of Service DoS attack. The attack was possible due to the lack of validation on overlapping ranges in the...