CVE-2026-125109 | BDVDB-2026-402488 Detail
rackrack
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.
Impact#
Per CVSS v3.1: confidentiality impact low, integrity impact low, availability impact none. Attack vector: network.
Weaknesses#
- CWE-1286 Improper Validation of Syntactic Correctness of Input
References#
- https://github.com/rack/rack/security/advisories/GHSA-2j8w-xcrc-x985
- https://github.com/rack/rack/commit/4380381a56dc52556a436d6d794c8e18dc8b0565
- https://github.com/rack/rack/commit/49386f460286b7346c7003b69a839de782cc8a39
- https://github.com/rack/rack/releases/tag/v3.1.23
- https://github.com/rack/rack/releases/tag/v3.2.8
Exploit#
No public exploit known
History#
- Version 1Record published in the CVE List.
- Version 2Most recent update recorded in the CVE List.