CVSS 3.0
7.5 highCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HCVE-2025-31137
High (7.5). EPSS 1.2% chance of exploitation in the next 30 days. Fixed in @react-router/express 7.4.1.
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.
Severity
- EPSS
- 1.2% chance of exploitation in the next 30 days; higher than 67% of CVEs (scores of 2026-10-31)
- CWE
- CWE-444
- Published
- Modified
- Record from
- the NVD, synced
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-4q56-crqp-v477 | npm | @react-router/express | >=7.0.0 <7.4.1 | 7.4.1 |
| GHSA-4q56-crqp-v477 | npm | @remix-run/express | >=2.11.1 <2.16.3 | 2.16.3 |