# CVE-2026-42342: React Router vulnerable to DoS via unbounded path expansion in __manifest endpoint

> CVE-2026-42342: React Router vulnerable to DoS via unbounded path expansion in __manifest endpoint. CVSS 7.5 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-42342
Last updated: 2026-07-21T19:10:00Z

- Published: 2026-06-02 18:23 UTC · Updated: 2026-07-21 19:10 UTC · Assigner: GitHub\_M
- CVSS: 7.5 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS: 0.30%, 22th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-400

## Description

React Router is a router for React. In versions 7.0.0 through 7.14.x of react-router and versions 2.10.0 through 2.17.4 of @remix-run/server-runtime, certain crafted requests can consume disproportionate server resources via unbounded path expansion in the \_\_manifest endpoint, resulting in response time degradation and/or service unavailability for end users. This affects React Router Framework Mode applications as well as Remix applications. This does not impact applications using Declarative Mode (\`\<BrowserRouter\>\`) or Data Mode (\`createBrowserRouter/\<RouterProvider\>\`). This is patched in react-router version 7.15.0 and @remix-run/server-runtime version 2.17.5.

## Affected vendors and products

- remix-run: react-router
- remix-run: @remix-run/server-runtime

## Tracked companies

- [Jira](https://rewindex.com/company/jira.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-42342)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-42342)
- [https://github.com/remix-run/react-router/security/advisories/GHSA-8x6r-g9mw-2r78](https://github.com/remix-run/react-router/security/advisories/GHSA-8x6r-g9mw-2r78)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-42342 · Markdown: https://rewindex.com/cve/CVE-2026-42342.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-42342 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:15:53.630Z