npm/react-router CVE-2026-21884: high 8.2, EPSS 0.53%

React Router SSR XSS in ScrollRestoration

Action: Upgrade react-router to 7.12.0 or later.

npm i react-router@7.12.0

Affected

Fixed versions

Sources

• osv: GHSA-8v8x-cx79-35w7
• https://github.com/remix-run/react-router/security/advisories/GHSA-8v8x-cx79-35w7
• https://nvd.nist.gov/vuln/detail/CVE-2026-21884
• https://github.com/remix-run/react-router/pull/14705
• https://github.com/remix-run/react-router/commit/c89c32c562a7723c45ee71dab1c892acaf7a608d
• https://access.redhat.com/errata/RHSA-2026:19712
• https://access.redhat.com/errata/RHSA-2026:3782
• https://access.redhat.com/errata/RHSA-2026:3958
• https://access.redhat.com/errata/RHSA-2026:3960
• https://access.redhat.com/security/cve/CVE-2026-21884
• https://bugzilla.redhat.com/show_bug.cgi?id=2428421
• https://github.com/remix-run/react-router
• https://github.com/remix-run/react-router/blob/react-router%407.12.0/CHANGELOG.md#v7120
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-21884.json

CVE-2026-21884 · published 2026-01-08T20:50:05Z · modified 2026-09-08T16:45:04.190133160Z · JSON