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Tool Directory

CVE-2025-43864

HighPublished

React Router allows a DoS via cache poisoning by forcing SPA mode

Published: Apr 25, 2025
Updated: Apr 25, 2025
Assigning CNA: GitHub_M
Evidence observed: Aug 4, 2026

Primary CVSS

7.5/ 10High

nvd · CVSS 3.1

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

EPSS probability estimate

20.3%

Moderate · next 30 days

Percentile: 97.4%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

DoS-via-cache-poisoning-by-forcing-SPA-mode-CVE-2025-43864-PoC
Proof-of-concept for a denial-of-service attack via cache poisoning by forcing SPA mode, targeting CVE-2025-43864 in React Router applications.

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