CVE-2026-42211

Description

React Router is a router for React. In versions 7.0.0 through 7.14.1, when using Framework Mode, a combination of steps could potentially allow unauthorized remote code execution (RCE) through external requests. This attack requires the application code to have an existing prototype pollution vulnerability, which can then be leveraged in a 2-step attack where the second step triggers unauthorized RCE on the remote server. This does not impact applications using Declarative Mode (`<BrowserRouter>`) or Data Mode (`createBrowserRouter/<RouterProvider>`). This is patched in version 7.14.2.

CVSS Metrics

• v3.1•HIGH•Score: 8.1CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Trends

Current EPSS score: 0.42%• Percentile: 36%

Techniques & Countermeasures

• CWE-502•Deserialization of Untrusted Data

  The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.

Affected Systems

• chainguard•airflow-2

  all

• chainguard•airflow-core-2

  all

• chainguard•vitess-24

  < 24.0.1-r2

• wolfi•vitess-24

  < 24.0.1-r2

• Npm•react-router

  ≥ 7.0.0, < 7.14.2

• remix-run•react-router

  ≥ 7.0.0, < 7.14.2

• shopify•react-router

  ≥ 7.0.0, < 7.14.2

References (4)

• https://github.com/remix-run/react-router/security/advisories/GHSA-49rj-9fvp-4h2h
• https://nvd.nist.gov/vuln/detail/CVE-2026-42211
• https://github.com/remix-run/react-router
• https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42211.json