Allocation of Resources Without Limits or Throttling Affecting rack package, versions <2.2.19>=3.1.0, <3.1.17>=3.2.0, <3.2.2
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- published7 Oct 2025
- disclosed7 Oct 2025
- creditkwkr
Introduced: 7 Oct 2025
NewCVE-2025-61770 (opens in a new tab)How to fix?
Upgrade rack to version 2.2.19, 3.1.17, 3.2.2 or higher.
Overview
rack is a minimal, modular and adaptable interface for developing web applications in Ruby. By wrapping HTTP requests and responses in the simplest way possible, it unifies and distills the API for web servers, web frameworks, and software in between (the so-called middleware) into a single method call.
Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling via the Rack::Multipart::Parser. An attacker can cause excessive memory consumption and potential process termination by sending multipart/form-data requests with a large preamble, leading to significant memory spikes and possible denial of service. The impact increases with higher allowed request sizes and concurrency.
Workaround
This vulnerability can be mitigated by limiting the total request body size at the proxy or web server level and by monitoring memory usage and setting per-process memory limits to prevent out-of-memory conditions.