Executive Summary

CVE-2026-22029 affects @remix-run/router <1.23.2 and react-router 7.0.0‑7.11.0. In Framework, Data, or unstable RSC modes, loaders or actions can generate open navigation redirects that resolve to unsafe URLs, enabling unintended JavaScript execution on the client. The flaw is exploitable only when redirect paths are built from untrusted content or via an open redirect. No impact when using Declarative Mode (). The issue is fixed in @remix-run/router 1.23.2 and react-router 7.12.0. KEV status: not listed.

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Authoritative CVE Metadata - CVSS Base Score: 8.0 (HIGH) - Published: 2026-01-10T03:15:48.870 - Last Modified: 2026-09-09T13:18:47.880

Original Description: React Router is a router for React. In @remix-run/router version prior to 1.23.2 and react-router 7.0.0 through 7.11.0, React Router (and Remix v1/v2) SPA open navigation redirects originating from loaders or actions in Framework Mode, Data Mode, or the unstable RSC modes can result in unsafe URLs causing unintended javascript execution on the client. This is only an issue if you are creating redirect paths from untrusted content or via an open redirect. There is no impact if Declarative Mode () is being used. This issue has been patched in @remix-run/router version 1.23.2 and react-router version 7.12.0.

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