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CVE-2025-61780 — Rack has Possible Information Disclosure Vulnerability

Affected: rack

Rack is a modular Ruby web server interface. Prior to versions 2.2.20, 3.1.18, and 3.2.3, a possible information disclosure vulnerability existed in `Rack::Sendfile` when running behind a proxy that supports `x-sendfile` headers (such as Nginx). Specially crafted headers could cause `Rack::Sendfile` to miscommunicate with the proxy and trigger unintended internal requests, potentially bypassing proxy-level access restrictions. When `Rack::Sendfile` received untrusted `x-sendfile-type` or `x-accel-mapping` headers from a client, it would interpret them as proxy configuration directives. This could cause the middleware to send a "redirect" response to the proxy, prompting it to reissue a new internal request that was not subject to the proxy's access controls. An attacker could exploit this by setting a crafted `x-sendfile-type: x-accel-redirect` header, setting a crafted `x-accel-mapping` header, and requesting a path that qualifies for proxy-based acceleration. Attackers could bypass proxy-enforced restrictions and access internal endpoints intended to be protected (such as administrative pages). The vulnerability did not allow arbitrary file reads but could expose sensitive application routes. This issue only affected systems meeting all of the following conditions: The application used `Rack::Sendfile` with a proxy that supports `x-accel-redirect` (e.g., Nginx); the proxy did **not** always set or remove the `x-sendfile-type` and `x-accel-mapping` headers; and the applicat…

USN-7960-1 — ruby-rack vulnerabilities

Affected: Ubuntu:Pro:16.04:LTS: ruby-rack, Ubuntu:Pro:18.04:LTS: ruby-rack, Ubuntu:Pro:20.04:LTS: ruby-rack, Ubuntu:22.04:LTS: ruby-rack, Ubuntu:24.04:LTS: ruby-rack, Ubuntu:25.10: ruby-rack

It was discovered that Rack incorrectly handled certain query parameters. An attacker could possibly use this issue to cause a limited denial of service. This issue was only addressed in Ubuntu 20.04 LTS and Ubuntu 22.04 LTS. (CVE-2025-59830)

It was discovered that Rack did not properly handle certain multipart form data. An attacker could possibly use this issue to cause memory exhaustion, leading to a denial of service. This issue was only addressed in Ubuntu 22.04 LTS, Ubuntu 24.04 LTS and Ubuntu 25.10. (CVE-2025-61770, CVE-2025-61772)

It was discovered that Rack did not properly handle certain form fields. An attacker could possibly use this issue to cause memory exhaustion, leading to a denial of service. This issue was only addressed in Ubuntu 22.04 LTS, Ubuntu 24.04 LTS and Ubuntu 25.10. (CVE-2025-61771)

It was discovered that Rack did not properly handle certain headers. An attacker could possibly use this issue to bypass proxy access restrictions and obtain sensitive information. (CVE-2025-61780)

Tomoya Yamashita discovered that Rack did not properly manage memory under certain circumstances. An attacker could possibly use this issue to cause memory exhaustion, leading to a denial of service. This issue was only addressed in Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS and Ubuntu 25.10. (CVE-2025-61919)