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CVE-2026-55685
React Router: Unauthenticated Denial of Service via Inefficient Route Matching
High8.7EPSS 0.71%
- Published
- Updated
- Reserved
- Assigned by
- GitHub_M
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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_MCNA (assigner) | 4.0 | High8.7 | 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 |
| NVDNVD · Analyzed | 4.0 | High8.7 | 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
- EPSS (exploitation in 30 days)
- 0.71% · top 46% of all CVEs (6 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: partial
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The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.7.
Weakness
Affected products
- affected >= 7.0.0, < 7.18.0
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- npmreact-routerGHSA-chx6-hx7r-mcp5 (opens in a new tab)
References (6)
- https://github.com/remix-run/react-router/security/advisories/GHSA-chx6-hx7r-mcp5 (opens in a new tab)x_refsource_CONFIRM
- https://github.com/remix-run/react-router/security/advisories/GHSA-8x6r-g9mw-2r78 (opens in a new tab)x_refsource_MISC
- https://github.com/remix-run/react-router/pull/15186 (opens in a new tab)x_refsource_MISC
- https://github.com/remix-run/react-router/commit/09e6020d1950e54f361f7ad00938ecd4dde60929 (opens in a new tab)x_refsource_MISC
- https://github.com/remix-run/react-router/blob/main/CHANGELOG.md#v7180 (opens in a new tab)x_refsource_MISC
- https://github.com/remix-run/react-router/releases/tag/[email protected] (opens in a new tab)x_refsource_MISC
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-chx6-hx7r-mcp5 (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-55685)Record last updated .