CVE-2026-55685

HIGH

React Router is a router for React. In versions 7.0.0 through 7.17.0, the manifest endpoint could be accessed via unauthenticated targeted requests that would put heavy load on the server and slow down response times. This issue is a follow up to CVE-2026-42342, and does not does not impact React Router applications using Declarative Mode (<BrowserRouter>) or Data Mode (createBrowserRouter/<RouterProvider>). This issue has been fixed in version 7.18.0.

CVSS v3.1 Score

7.5
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Published: 7/27/2026Modified: 8/3/2026

Related Intelligence (1)

HIGHVulnerability

NVD HIGH: CVE-2026-55685 — React Router is a router for React. In versions 7.0.0 through 7.17.0, the manife...

React Router is a router for React. In versions 7.0.0 through 7.17.0, the manifest endpoint could be accessed via unauthenticated targeted requests that would put heavy load on the server and slow down response times. This issue is a follow up to CVE-2026-42342, and does not does not impact React Router applications using Declarative Mode (<BrowserRouter>) or Data Mode (createBrowserRouter/<Router

CVE-2026-55685
NIST NVD

References (6)

https://github.com/remix-run/react-router/blob/main/CHANGELOG.md#v7180Release Noteshttps://github.com/remix-run/react-router/commit/09e6020d1950e54f361f7ad00938ecd4dde60929Patchhttps://github.com/remix-run/react-router/pull/15186Issue TrackingPatchhttps://github.com/remix-run/react-router/releases/tag/react-router@7.18.0Release Noteshttps://github.com/remix-run/react-router/security/advisories/GHSA-8x6r-g9mw-2r78Third Party Advisoryhttps://github.com/remix-run/react-router/security/advisories/GHSA-chx6-hx7r-mcp5Third Party Advisory