Rack is a modular Ruby web server interface. Prior to versions 2.2.20, 3.1.18, and 3.2.3, `Rack::Request#POST` reads the entire request body into memory for `Content-Type: application/x-www-form-urlencoded`, calling `rack.input.read(nil)` without enforcing a length or cap. Large request bodies can therefore be buffered completely into process memory before parsing, leading to denial of service (DoS) through memory exhaustion. Users should upgrade to Rack version 2.2.20, 3.1.18, or 3.2.3, anu of which enforces form parameter limits using `query_parser.bytesize_limit`, preventing unbounded reads of `application/x-www-form-urlencoded` bodies. Additionally, enforce strict maximum body size at the proxy or web server layer (e.g., Nginx `client_max_body_size`, Apache `LimitRequestBody`).

Rack is a modular Ruby web server interface. Prior to versions 2.2.20, 3.1.18, and 3.2.3, `Rack::Request#POST` reads the entire request body into memory for `Content-Type: application/x-www-form-urlencoded`, calling `rack.input.read(nil)` without enforcing a length or cap. Large request bodies can therefore be buffered completely into process memory before parsing, leading to denial of service (DoS) through memory exhaustion. Users should upgrade to Rack version 2.2.20, 3.1.18, or 3.2.3, anu of which enforces form parameter limits using `query_parser.bytesize_limit`, preventing unbounded reads of `application/x-www-form-urlencoded` bodies. Additionally, enforce strict maximum body size at the proxy or web server layer (e.g., Nginx `client_max_body_size`, Apache `LimitRequestBody`).

Rack is a modular Ruby web server interface. Prior to versions 2.2.20, ...

Rack is vulnerable to a memory-exhaustion DoS through unbounded URL-encoded body parsing

Уязвимость класса Rack::Request#POST модульного интерфейса между веб-серверами и веб-приложениями Rack, позволяющая нарушителю вызвать отказ в обслуживании

Security update for rubygem-rack

Множественные уязвимости rubygem-rack

ELSA-2025-20962: pcs security update (IMPORTANT)

ELSA-2025-19719: pcs security update (IMPORTANT)

ELSA-2025-19513: pcs security update (IMPORTANT)

ELSA-2025-19512: pcs security update (IMPORTANT)