CVE-2026-34077

React Router vulnerable to Denial of Service via reflected user input in single-fetch

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.

Scores

Weaknesses (CWE)

• CWE-770

Advisories

• GHSA-rxv8-25v2-qmq8 — React Router vulnerable to Denial of Service via reflected user input in single-fetch

European references

• ENISA EUVD · EUVD-2026-33994
• GCVE · GCVE-0-2026-34077

CERT-FR advisories

• CERTFR-2026-AVI-0933 — Multiples vulnérabilités dans les produits IBM · cert.ssi.gouv.fr
• CERTFR-2026-AVI-0901 — Multiples vulnérabilités dans les produits IBM · cert.ssi.gouv.fr
• CERTFR-2026-AVI-0773 — Multiples vulnérabilités dans les produits Atlassian · cert.ssi.gouv.fr

Affected configurations (NVD CPE)

• cpe:2.3:a:shopify:react-router:*:*:*:*:*:node.js:*:* ≥ 7.0.0 < 7.14.0
• cpe:2.3:a:turbo-stream:turbo_stream:*:*:*:*:*:node.js:*:* < 3.0.0

Affected products

References

• https://github.com/remix-run/react-router/security/advisories/GHSA-rxv8-25v2-qmq8

Sources