CVE-2026-34827

Rack CVE-2026-34827 describes an algorithmic-DoS in Rack::Multipart::Parser#handle_mime_head where quoted multipart parameters are parsed with repeated String#index searches and slice! prefix deletion. Affected versions are 3.0.0.beta1 up to before 3.1.21, and 3.2.0 up to before 3.2.6. An unauthe...