CVE-2026-55685
React Router is a router for React.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.71%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 4.0
- 8.7 HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
- EPSS
- 0.71% probability · 53th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-400, CWE-407
- Affected
- shopify/react-router
- Source
- security-advisories@github.com
EPSS 0.7% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://github.com/remix-run/react-router/blob/main/CHANGELOG.md#v7180Release Notes
- https://github.com/remix-run/react-router/commit/09e6020d1950e54f361f7ad00938ecd4dde60929Patch
- https://github.com/remix-run/react-router/pull/15186Issue Tracking, Patch
- https://github.com/remix-run/react-router/releases/tag/react-router@7.18.0Release Notes
- https://github.com/remix-run/react-router/security/advisories/GHSA-8x6r-g9mw-2r78Third Party Advisory
- https://github.com/remix-run/react-router/security/advisories/GHSA-chx6-hx7r-mcp5Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.