CVE-2025-43864 (CVSS 7.5)

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.

Is your site exposed to CVE-2025-43864?

Run a free security scan — no signup, results in seconds.

CVSS v3.1 Score

7.5

HIGH

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

Weakness Type (CWE)

CWE-755 CWE-755

References

Other References

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

Frequently Asked Questions

What is CVE-2025-43864? +

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. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2025-43864? +

CVE-2025-43864 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

How do I check if I'm vulnerable to CVE-2025-43864? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

Related Vulnerabilities

CVE-2025-24478

A denial-of-service vulnerability exists in the affected products. The vulnerability could allow a remote, non-privileged user to send malicious requests …

CVE-2024-47609

Tonic is a native gRPC client & server implementation with async/await support. When using tonic::transport::Server there is a remote DoS …

CVE-2025-9437

A security issue exists within the Studio 5000 Logix Designer add-on profile (AOP) for the ArmorStart Classic distributed motor controller, …

CVE-2024-51502

loona is an experimental, HTTP/1.1 and HTTP/2 implementation in Rust on top of io-uring. `loona-hpack` suffers from the same vulnerability …

CVE-2024-41886

Team ENVY, a Security Research TEAM has found a flaw that allows for a remote code execution on the NVR. …

CVE-2026-49232

Routinator exits on any error when accepting incoming HTTP or RTR connections, including ones it can recover from such as …

CVE-2025-43864