CVE-2026-42342

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

Published Jun 2, 2026 CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

Sign in to view the affected projects.

Advisories

Source ID Title
Github GHSA Github GHSA GHSA-8x6r-g9mw-2r78 React Router vulnerable to DoS via unbounded path expansion in __manifest endpoint
History
Type Values Removed Values Added
First Time appeared Shopify
Shopify react-router
Shopify remix-run\/server-runtime
CPEs cpe:2.3:a:shopify:react-router:*:*:*:*:*:node.js:*:*
cpe:2.3:a:shopify:remix-run\/server-runtime:*:*:*:*:*:node.js:*:*
Vendors & Products Shopify
Shopify react-router
Shopify remix-run\/server-runtime
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Remix-run
Remix-run react-router
Remix-run server-runtime
Vendors & Products Remix-run
Remix-run react-router
Remix-run server-runtime
Type Values Removed Values Added
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.
Title React Router vulnerable to DoS via unbounded path expansion in __manifest endpoint
Weaknesses CWE-400
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Jun 3, 2026, 1:52 PM
Reserved
Apr 26, 2026, 1:26 PM
Status
Analyzed
Published
Jun 2, 2026, 8:16 PM
Modified
Jul 21, 2026, 7:10 PM
Severity
Moderate
Public date
Jun 2, 2026, 6:23 PM