CVE-2026-42342

HIGH

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

Title source: cna
STIX 2.1

Description

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.

References (1)

Core 1
Core References

Scores

CVSS v3 7.5
EPSS 0.0026
EPSS Percentile 17.4%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-400
Status published
Products (6)
npm/react-router 7.0.0 - 7.15.0npm
remix-run/@remix-run/server-runtime >= 2.10.0, < 2.17.5
remix-run/react-router >= 7.0.0, < 7.15.0
remix-run/server-runtime 2.10.0 - 2.17.5npm
shopify/react-router 7.0.0 - 7.15.0
shopify/remix-run\/server-runtime 2.10.0 - 2.17.5
Published Jun 02, 2026
Tracked Since Jun 03, 2026