CVE-2025-31137

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.

Reserved 2025-03-26 | Published 2025-04-01 | Updated 2025-04-02 | Assigner GitHub_M

Problem types

CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

Product status

>= 7.0.0, < 7.4.1
affected

>= 2.11.1, < 2.16.3
affected

References

github.com/...router/security/advisories/GHSA-4q56-crqp-v477

cve.org (CVE-2025-31137)

nvd.nist.gov (CVE-2025-31137)

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