CVE-2026-42342CWE-400

React Router vulnerable to DoS via unbounded path expansion in __manifest endpoint

High · published June 2, 2026

CVSS v3.1
7.5
EPSS
0%
Percentile
21.4
In the wild
Unconfirmed
What it is

React Router is a router for React. In versions 7.0.0 through 7.14.x of react-router and versions 2.10.0 through 2.17.4 of @remix-run/server-runtime, certain crafted requests can consume disproportionate server resources via unbounded path expansion in the __manifest endpoint, resulting in response time degradation and/or service unavailability for end users. This affects React Router Framework Mode applications as well as Remix applications. This does not impact applications using Declarative Mode (`<BrowserRouter>`) or Data Mode (`createBrowserRouter/<RouterProvider>`). This is patched in react-router version 7.15.0 and @remix-run/server-runtime version 2.17.5.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00299 · 21.4th percentile
Weakness
CWE-400 · Uncontrolled Resource Consumption
Published
2026-06-02T18:23Z
EPSS history
Timeline
  • 02 JUN 18:23Z
    React Router vulnerable to DoS via unbounded path expansion in __manifest endpoint
    cvelistv5