CVE-2026-34827: Inefficient Algorithmic Complexity

Rack is a modular Ruby web server interface. From versions 3.0.0.beta1 to before 3.1.21, and 3.2.0 to before 3.2.6, Rack::Multipart::Parserhandlemimehead parses quoted multipart parameters such as Content-Disposition: form-data; name="..." using repeated Stringindex searches combined with...

Regular Expression Denial Of Service(ReDoS)

rack is vulnerable to Regular Expression Denial of ServiceReDoS. The vulnerability exists in the handlemimehead function of multipart.rb due to inefficient regular expression complexity which allows an attacker to crash the application by submitting a malicious input with the Content-Disposition...