CVE-2026-26962

Summary : Rack (Ruby web server interface) versions 3.2.0–3.2.5 are affected by a header unfolding issue in Rack::Multipart::Parser. When a multipart header includes an obs-fold sequence, the parser preserves the embedded CRLF in parsed parameter values (e.g., filename or name) during unfolding, ...

CVE-2026-26962 Rack: Header injection in multipart requests

Rack is a modular Ruby web server interface. From version 3.2.0 to before version 3.2.6, Rack::Multipart::Parser unfolds folded multipart part headers incorrectly. When a multipart header contains an obs-fold sequence, Rack preserves the embedded CRLF in parsed parameter values such as filename o...