# CVE-2026-34077: React Router vulnerable to Denial of Service via reflected user input in single-fetch

> CVE-2026-34077: React Router vulnerable to Denial of Service via reflected user input in single-fetch. CVSS 7.5 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-34077
Last updated: 2026-07-22T19:10:00Z

- Published: 2026-06-02 17:31 UTC · Updated: 2026-07-22 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: 0.29%, 22th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-770

## Description

React Router is a router for React. In versions 7.7.0 through 7.13.1, when using React Router's unstable React Server Components (RSC) APIs, there is a potential client-side Cross-Site Scripting (XSS) vulnerability in the RSC redirect handling if redirects come from untrusted sources. This does not impact applications that are not using the unstable RSC APIs in React Router. This is patched in version 7.13.2.

## Affected vendors and products

- remix-run: react-router
- remix-run: turbo-stream

## Tracked companies

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

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-34077)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-34077)
- [https://github.com/remix-run/react-router/security/advisories/GHSA-rxv8-25v2-qmq8](https://github.com/remix-run/react-router/security/advisories/GHSA-rxv8-25v2-qmq8)

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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-2026-34077 · Markdown: https://rewindex.com/cve/CVE-2026-34077.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-34077 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:09:56.155Z