There exists a potential DOS attack vector in React Router Framework Mode applications (as well as Remix v2.10.0 - 2.17.4). Certain requests can be crafted to consume disproportionate resources on the server, resulting in response time degredation and/or service unavailability for end users.
> [!NOTE] > This does not impact your React Router application if you are using Declarative Mode () or Data Mode (createBrowserRouter/).
// cvss v3.1 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Checked 2026-09-26 at 01:02 UTC. The most recent advisory here was published 2026-06-15. Updated continuously from NVD, GHSA, OSV and CNA feeds.