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.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
remix-run react-router affected
Version Status Constraints
>= 7.0.0, < 7.18.0 affected —

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Project Subscriptions

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-chx6-hx7r-mcp5 React Router: Unauthenticated Denial of Service via Inefficient Route Matching
Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/remix-run/react-router/blob/main/CHANGELOG.md#v7180 cve-icon
https://github.com/remix-run/react-router/commit/09e6020d1950e54f361f7ad00938ecd4dde60929 cve-icon
https://github.com/remix-run/react-router/pull/15186 cve-icon
https://github.com/remix-run/react-router/releases/tag/react-router@7.18.0 cve-icon
https://github.com/remix-run/react-router/security/advisories/GHSA-8x6r-g9mw-2r78 cve-icon
https://github.com/remix-run/react-router/security/advisories/GHSA-chx6-hx7r-mcp5 cve-icon
History

Mon, 27 Jul 2026 23:30:00 +0000

Type Values Removed Values Added
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.
Title React Router: Unauthenticated Denial of Service via Inefficient Route Matching
Weaknesses CWE-400
CWE-407
References
Metrics cvssV4_0

{'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'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-07-27T21:45:57.751Z

Reserved: 2026-06-17T00:13:10.650Z

Link: CVE-2026-55685

cve-icon Vulnrichment

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cve-icon NVD

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cve-icon Redhat

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cve-icon OpenCVE Enrichment

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Weaknesses