CVE-2026-42342

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

State: Published
Severity: 7.5 High
Published: Jun 2, 2026
Updated: Jun 3, 2026
Reserved: Apr 26, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	GitHub_M

Weaknesses

CWE-400 Uncontrolled Resource Consumption

Affected Products

Product	Versions
react-routerremix-run	>= 7.0.0, < 7.15.0Affected
@remix-run/server-runtimeremix-run	>= 2.10.0, < 2.17.5Affected

References

https://github.com/remix-run/react-router/security/advisories/GHSA-8x6r-g9mw-2r78

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