React Router is a router for React. In versions 6.4.0 through 7.17.0, if application code was written in a way that allows attacker-supplied input to overwrite certain aspects of errors caught by the SSR process, then it was possible for an attacker to trigger unexpected constructor execution on the client, which would in turn trigger an outbound network request. This is only possible with very specific (and unlikely) application-layer code. Note that this does not impact an application if it is using Declarative Mode. It only impacts Framework Mode and Data Mode applications that perform manual SSR/hydration. This issue has been fixed in version 7.18.0.
Fix
Patch, vendor advisory and mitigation references on NVD 2
- https://github.com/remix-run/react-router/commit/9d22943fd46c8ae4b08236425fa3549e10e9ad1a Patch
- https://github.com/remix-run/react-router/pull/15175 Issue Tracking, Patch
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 6.1 · shopifyNVD modified 2026-10-24 13:10
Affected (CPE criteria) 1
cpe:2.3:a:shopify:react-router:*:*:*:*:*:node.js:*:*
References 5
- https://github.com/remix-run/react-router/blob/main/CHANGELOG.md#v7180 Release Notes
- https://github.com/remix-run/react-router/commit/9d22943fd46c8ae4b08236425fa3549e10e9ad1a Patch
- https://github.com/remix-run/react-router/pull/15175 Issue Tracking, Patch
- https://github.com/remix-run/react-router/releases/tag/[email protected] Release Notes
- https://github.com/remix-run/react-router/security/advisories/GHSA-337j-9hxr-rhxg Third Party Advisory