🛡️ CVE-2025-31137
🟠 CVSS 8.0 — High ✅ No Known Exploit CWE-444 NVD
8.0
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

Details

Severity HIGH
CVSS Score 8.0
CVSS Vector CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE CWE-444
Public Exploit ✅ No
Source NVD
Published 2025-04-01
Updated 2026-06-02
Modified 2025-04-01
Fix URL N/A

Affected Packages

Software From version Fixed in
@react-router/express — —
@remix-run/express — —
unknown — —

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