CVE-2025-31137

A flaw was found in react-router due to improper handling of user-controlled data within the Express adapter. This flaw allows a remote attacker to trigger a server-side request forgery (SSRF) condition. This SSRF can be exploited by sending crafted HTTP requests to arbitrary internal or external resources. Successful exploitation results in a high impact denial of service.

This vulnerability allows URL spoofing, which can lead to unauthorized access to resources and potential data breaches. The fact that it requires no authentication or user interaction significantly increases its exploitability. The use of Host or X-Forwarded-Host headers, which are commonly used in web applications, makes this a widespread issue. While arbitrary code execution isn't directly possible based on the description, the ability to manipulate URLs and potentially access sensitive data warrants an Important impact rating.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.