# CVE-2025-43864

## Summary

- **CVE ID:** CVE-2025-43864
- **Severity:** HIGH
- **CVSS Score:** 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
- **CWE:** CWE-755
- **Published:** Apr 25, 2025
- **Last Modified:** Mar 13, 2026

## 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.

## Affected Products

- remix-run — react-router (>= 7.2.0, < 7.5.2)

## References

- [CNA](https://github.com/remix-run/react-router/security/advisories/GHSA-f46r-rw29-r322)
- [CNA](https://github.com/remix-run/react-router/commit/c84302972a152d851cf5dd859ff332b354b70111)
- [CNA](https://github.com/remix-run/react-router/blob/e6c53a0130559b4a9bd47f9cf76ea5b08a69868a/packages/react-router/lib/server-runtime/server.ts#L407)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 20.21%
- **EPSS Percentile:** 97.3

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._