The vulnerability in the Rack::Request#POST class of the modular interface between web servers and Rack web applications allows a attacker to cause a service failure.

The vulnerability in the Rack::RequestPOST class of the modular interface between web servers and Rack web applications involves an uncontrolled resource consumption. Exploiting this vulnerability can allow a malicious actor to cause service failures...

rubygem-rack: Unbounded read in `Rack::Request` form parsing can lead to memory exhaustion

A memory-exhaustion vulnerability exists in Rack when parsing application/x-www-form-urlencoded request bodies. Rack::RequestPOST reads the entire request body into memory without enforcing a maximum length or cap. Attackers can exploit this by sending large form submissions, potentially causing...

CVE-2025-61919: Uncontrolled Resource Consumption

Rack is a modular Ruby web server interface. Prior to versions 2.2.20, 3.1.18, and 3.2.3, Rack::RequestPOST reads the entire request body into memory for Content-Type: application/x-www-form-urlencoded, calling rack.input.readnil without enforcing a length or cap. Large request bodies can therefo...