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    CVE-2026-55685

    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.

    Published:Jul 27, 2026
    Last Modified:Jul 28, 2026
    EPS:Jul 27, 2026
    EPSS Score:0.00577
    CVSS Score:8.7

    Affected Products

    Vendor
    Remix-run
    Product
    React-router

    Exploits

    No exploit reference

    Related CVEs

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    CVE-2026-53667 (CVSS 6.9) — React Router is a router for React. In versions 7.11.0 through 7.17.0, the RSCErrorHandler is missing protocol…
    CVE-2026-53666 (CVSS 6.1) — React Router is a router for React. In versions 6.4.0 through 7.17.0, if application code was written in a way…
    CVE-2026-53663 (CVSS 3.1) — React Router is a router for React. From 7.12.0 until 7.15.1, certain CSRF checks in React Router v7 Framework…
    CVE-2026-42342 (CVSS 7.5) — React Router is a router for React. In versions 7.0.0 through 7.14.x of react-router and versions 2.10.0 throu…
    CVE-2026-42211 (CVSS 8.1) — React Router is a router for React. In versions 7.0.0 through 7.14.1, when using Framework Mode, a combination…
    CVE-2026-40181 (CVSS 6.6) — React Router is a router for React. In versions 7.0.0 through 7.14.0 and 6.7.0 through 6.30.3, certain URLs pa…
    CVE-2026-34077 (CVSS 7.5) — React Router is a router for React. In versions 7.7.0 through 7.13.1, when using React Router's unstable React…
    CVE-2026-33245 (CVSS 8) — React Router is a router for React. In versions 7.7.0 through 7.13.1, when using React Router's unstable React…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High