CVE-2025-31137
Remix and React Router allow URL manipulation via Host / X-Forwarded-Host headers
HIGH 7.5
At a glance
- Source
- NVD
- EPSS
- EPSS 1.19 % · percentile 68 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- GitHub_M
- NVD status
- Deferred
Description
React Router is a multi-strategy router for React bridging the gap from React 18 to React 19. There is a vulnerability in Remix/React Router that affects all Remix 2 and React Router 7 consumers using the Express adapter. Basically, this vulnerability allows anyone to spoof the URL used in an incoming Request by putting a URL pathname in the port section of a URL that is part of a Host or X-Forwarded-Host header sent to a Remix/React Router request handler. This issue has been patched and released in Remix 2.16.3 and React Router 7.4.1.
Weaknesses (CWE)
- CWE-444 — HTTP Request/Response Smuggling
References
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.0 | HIGH 7.5 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | GitHub_M |
| CVSS 3.0 | HIGH 7.5 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | NVD · security-advisories@github.com (Secondary) |
Advisories
- GHSA-4q56-crqp-v477 — Remix and React Router allow URL manipulation via Host / X-Forwarded-Host headers
European references
- ENISA EUVD · EUVD-2025-9433
- GCVE · GCVE-0-2025-31137
Affected products
| Product | Versions |
|---|---|
| remix-run · react-router | affected >= 7.0.0, < 7.4.1 ; affected >= 2.11.1, < 2.16.3 |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |