Vulnerability in Remix-run React-router
CVE-2025-43865
React Router is a router for React. In versions on the 7.0 branch prior to version 7.5.2, it's possible to modify pre-rendered data by adding a header to the request. This allows to completely spoof its contents and modify all the values …
EPSS: 0.006 (70.6th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H.
Affected products
- Remix-run React-router — versions >= 7.0, < 7.5.2
Weakness classification (CWE)
Public proof-of-concept exploits
References
- https://github.com/remix-run/react-router/security/advisories/GHSA-cpj6-fhp6-mr6j (x_refsource_CONFIRM)
- https://github.com/remix-run/react-router/commit/c84302972a152d851cf5dd859ff332b354b70111 (x_refsource_MISC)
- https://github.com/remix-run/react-router/blob/e6c53a0130559b4a9bd47f9cf76ea5b08a69868a/packages/react-router/lib/server-runtime/routes.ts#L87 (x_refsource_MISC)
Frequently asked questions
- What is CVE-2025-43865?
- CVE-2025-43865 is a high-severity vulnerability in Remix-run React-router, classified under Insufficient Verification of Data Authenticity. CVSS score: 8.2/10. Published 2025-04-25.
- How severe is CVE-2025-43865?
- High severity. CVSS v3 base score is 8.2 out of 10.
- Is CVE-2025-43865 known to be exploited?
- 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.