CVE-2026-40181
React Router's same-origin redirect with path starting // causes open redirect via protocol-relative URL reinterpretation
EPSS 0.04%
Description
Certain URLs passed to the `redirect` function can trigger an open redirect to an external domain depending on the level of validation done by the application prior to returning the `redirect`. > [!NOTE] > This does not impact your React Router application if you are using [Declarative Mode](https://reactrouter.com/start/modes#declarative) (`<BrowserRouter>`)
How to fix CVE-2026-40181
To remediate CVE-2026-40181, upgrade the affected package to a fixed version below.
- —upgrade to 7.14.1 or later
Is CVE-2026-40181 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- >= 7.0.0, < 7.14.1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U |