CVE-2025-43864

HIGH

NPM React-router < 7.5.2 - Improper Exception Handling

Title source: rule

Description

React Router is a router for React. Starting in version 7.2.0 and prior to version 7.5.2, it is possible to force an application to switch to SPA mode by adding a header to the request. If the application uses SSR and is forced to switch to SPA, this causes an error that completely corrupts the page. If a cache system is in place, this allows the response containing the error to be cached, resulting in a cache poisoning that strongly impacts the availability of the application. This issue has been patched in version 7.5.2.

Exploits (1)

nomisec STUB 1 stars

by pouriam23 · poc

https://github.com/pouriam23/DoS-via-cache-poisoning-by-forcing-SPA-mode-CVE-2025-43864-

View Code ZIP pw:eip

References (3)

[Vendor Advisory] https://github.com/remix-run/react-router/security/advisories/GHSA-f46r-rw29-r322

[Patch] https://github.com/remix-run/react-router/commit/c84302972a152d851cf5dd859ff332b354b70111

[Various Sources] https://github.com/remix-run/react-router/blob/e6c53a0130559b4a9bd47f9cf76ea5b08a69868a/packages/react-router/lib/server-runtime/server.ts#L407

Scores

CVSS v3 7.5

EPSS 0.0037

EPSS Percentile 59.1%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment

Exploitation poc

Automatable yes

Technical Impact partial

Details

CWE

CWE-755

Status published

Products (2)

npm/react-router 7.2.0 - 7.5.2npm

remix-run/react-router >= 7.2.0, < 7.5.2

Published Apr 25, 2025

Tracked Since Feb 18, 2026