CVE-2026-55685

high

Description

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.

References

Advisories
More

https://github.com/remix-run/react-router/security/advisories/GHSA-chx6-hx7r-mcp5

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

https://github.com/remix-run/react-router/releases/tag/[email protected]

https://github.com/remix-run/react-router/pull/15186

https://github.com/remix-run/react-router/commit/09e6020d1950e54f361f7ad00938ecd4dde60929

https://github.com/remix-run/react-router/blob/main/CHANGELOG.md#v7180

Details

Source: Mitre, NVD

Published: 2026-07-27

Updated: 2026-08-03

Risk Information

CVSS v2

Base Score: 7.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C

Severity: High

CVSS v3

Base Score: 7.5

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Severity: High

CVSS v4

Base Score: 8.7

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Severity: High

EPSS

EPSS: 0.00577