React Router allows pre-render data spoofing on React-Router framework mode

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

• CISA KEV Not listed.
• EPSS 0.0081, the 57th percentile, on 11 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

1. 24 Apr 2025, 14:55 UTC Published by the maintainers as a GitHub repository advisory

Sources

• GitHub Advisory Database: GHSA-cpj6-fhp6-mr6j
• OSV: GHSA-cpj6-fhp6-mr6j
• github.com/remix-run/react-router/security/advisories/GHSA-cpj6-fhp6-mr6j
• nvd.nist.gov/vuln/detail/CVE-2025-43865
• github.com/remix-run/react-router/commit/c84302972a152d851cf5dd859ff332b354b70111
• github.com/remix-run/react-router
• github.com/remix-run/react-router/blob/e6c53a0130559b4a9bd47f9cf76ea5b08a69868a/packages/react-router/lib/server-runtime/routes.ts#L87

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.