| Name | CVE-2025-61919 |
| Description | 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`). |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| ruby-rack (PTS) | bullseye | 2.1.4-3+deb11u2 | vulnerable |
| bullseye (security) | 2.1.4-3+deb11u3 | vulnerable | |
| bookworm, bookworm (security) | 2.2.13-1~deb12u1 | vulnerable | |
| forky, sid, trixie | 3.1.16-0.1 | vulnerable |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| ruby-rack | source | (unstable) | (unfixed) |
https://github.com/rack/rack/security/advisories/GHSA-6xw4-3v39-52mm
https://github.com/rack/rack/commit/e179614c4a653283286f5f046428cbb85f21146f (v3.2.3)
https://github.com/rack/rack/commit/cbd541e8a3d0c5830a3c9a30d3718ce2e124f9db (v3.1.18)
https://github.com/rack/rack/commit/4e2c903991a790ee211a3021808ff4fd6fe82881 (v2.2.20)