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.

Scores

Weaknesses (CWE)

• CWE-755

Advisories

• GHSA-f46r-rw29-r322 — React Router allows a DoS via cache poisoning by forcing SPA mode

European references

• ENISA EUVD · EUVD-2025-11980
• GCVE · GCVE-0-2025-43864

CERT-FR advisories

• CERTFR-2026-AVI-0054 — Multiples vulnérabilités dans Centreon Infra Monitoring · cert.ssi.gouv.fr
• CERTFR-2025-AVI-1127 — Multiples vulnérabilités dans Centreon Web · cert.ssi.gouv.fr

Affected products

References

• 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

Sources