What is CVE-2025-61686?

CVE-2025-61686 is a critical-severity vulnerability in Remix-run React-router, classified under Path Traversal. CVSS score: 9.1/10. Published 2026-01-10.

How severe is CVE-2025-61686?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Is CVE-2025-61686 known to be exploited?

3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Path Traversal in Remix-run React-router

CVE-2025-61686

React Router is a router for React. In @react-router/node versions 7.0.0 through 7.9.3, @remix-run/deno prior to version 2.17.2, and @remix-run/node prior to version 2.17.2, if createFileSessionStorage() is being used from @react-router/no…

Vulnerability class: Path Traversal (Directory Traversal)

EPSS: 0.000 (9.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H.

Affected products

Remix-run React-router — versions @react-router/node >= 7.0.0, < 7.9.4, @remix-run/deno < 2.17.2, @remix-run/node < 2.17.2

Weakness classification (CWE)

CWE-22 — Path Traversal

Public proof-of-concept exploits

References

https://github.com/remix-run/react-router/security/advisories/GHSA-9583-h5hc-x8cw (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2025-61686?: CVE-2025-61686 is a critical-severity vulnerability in Remix-run React-router, classified under Path Traversal. CVSS score: 9.1/10. Published 2026-01-10.
How severe is CVE-2025-61686?: Critical severity. CVSS v3 base score is 9.1 out of 10.
Is CVE-2025-61686 known to be exploited?: 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.