CVE-2026-125109
4.8 MEDIUMpublic exploit availablePublished 2026-11-09 · Updated 2026-11-10
AI analysis for this CVE has not been generated yet. Raw NVD data is shown below.
NVD 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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Weaknesses
CWE-1286
Public exploit & PoC references
- 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
- https://github.com/rack/rack/security/advisories/GHSA-2j8w-xcrc-x985
All references
- 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
- https://github.com/rack/rack/security/advisories/GHSA-2j8w-xcrc-x985
Source data: NVD (nvd.nist.gov), public domain. Exploit-DB.ai adds local AI analysis for defensive use only.
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