CVE-2025-31137 – @react-router/express

Package

Manager: npm
Name: @react-router/express
Vulnerable Version: >=7.0.0 <7.4.1

Severity

Level: High

CVSS v3.1: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

EPSS: 0.00012 pctl0.0127

Details

Remix and React Router allow URL manipulation via Host / X-Forwarded-Host headers ### Impact We received a report about 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. ### Patches This issue has been patched and released in Remix 2.16.3 React Router 7.4.1. ### Credits - Rachid Allam (zhero;) - Yasser Allam (inzo_)

Metadata

Created: 2025-04-01T22:23:33Z
Modified: 2025-04-01T22:23:33Z
Source: https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/04/GHSA-4q56-crqp-v477/GHSA-4q56-crqp-v477.json
CWE IDs: ["CWE-444"]
Alternative ID: GHSA-4q56-crqp-v477
Finding: F110
Auto approve: 1