Information Exposure Affecting rack package, versions <2.2.20>=3.0.0.beta1, <3.1.18>=3.2.0, <3.2.3
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-RUBY-RACK-13524628
- published10 Oct 2025
- disclosed10 Oct 2025
- creditUnknown
Introduced: 10 Oct 2025
NewCVE-2025-61780 (opens in a new tab)How to fix?
Upgrade rack to version 2.2.20, 3.1.18, 3.2.3 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 Information Exposure in the Rack::Sendfile() when running behind a proxy that supports x-sendfile headers. An attacker can access internal endpoints intended to be protected by sending specially crafted x-sendfile-type or x-accel-mapping headers, causing the proxy to reissue internal requests that bypass access controls. This is only exploitable if the application uses Rack::Sendfile with a proxy supporting x-accel-redirect, the proxy does not always set or remove the x-sendfile-type and x-accel-mapping headers, and the application exposes an endpoint that returns a body responding to .to_path.
Workaround
This vulnerability can be mitigated by configuring the proxy to always set or strip the affected headers, or by disabling sendfile functionality in Rails applications.