CVE-2025-43864

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

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.

Category

7.5
CVSS
Severity: High
CVSS 3.1 •
EPSS 0.05%
Affected: remix-run react-router
Published at:
Updated at:

References

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

Frequently Asked Questions

What is the severity of CVE-2025-43864?
CVE-2025-43864 has been scored as a high severity vulnerability.
How to fix CVE-2025-43864?
To fix CVE-2025-43864, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-43864 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2025-43864 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-43864?
CVE-2025-43864 affects remix-run react-router.
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