| Name | CVE-2026-125109 |
| Description | Rack is a modular Ruby web server interface. From 3.0 until 3.1.23 and 3.2.8, Rack::Request#host_with_port, #base_url, and #url can return an attacker-controlled invalid authority from Host, X-Forwarded-Host, or Forwarded: host= verbatim. Applications without an independent host allowlist that use these methods for absolute URLs, redirects, or origin-dependent checks can emit attacker-chosen delimiters, enabling redirect manipulation, string-based allowlist bypass, or unescaped markup reflection. Rails overrides these methods and is not expected to be affected. This issue is fixed in versions 3.1.23 and 3.2.8. |
| Source | CVE (at NVD; CERT, ENISA, 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) | bookworm | 2.2.22-0+deb12u1 | vulnerable |
| bookworm (security) | 2.2.22-0+deb12u2 | vulnerable | |
| trixie | 3.1.20-0+deb13u1 | vulnerable | |
| trixie (security) | 3.1.20-0+deb13u2 | vulnerable | |
| forky, sid | 3.2.8-1 | fixed |
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) | 3.2.8-1 |
https://github.com/rack/rack/security/advisories/GHSA-2j8w-xcrc-x985