Is react-router affected by CVE-2026-42211?

npm react-router is affected in >=7.0.0 <7.14.2.

Is CVE-2026-42211 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.4%.

high

CVE-2026-42211

Q: Is CVE-2026-42211 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.4%.

npm · react-router

Summary

React Router's vendored turbo-stream v2 allows arbitrary constructor invocation via TYPE_ERROR deserialization leading to Unauth RCE

Severity: high
EPSS: 0.4% (p35)
Also known as: GHSA-49rj-9fvp-4h2h
Published: 2026-06-03

References

Related advisories

GHSA-qwww-vcr4-c8h2 — high · npm/react-router
CVE-2026-55685 — high · npm/react-router
CVE-2026-34077 — high · npm/react-router
CVE-2026-42342 — high · npm/react-router
CVE-2026-33245 — high · npm/react-router
CVE-2026-53669 — medium · npm/react-router
CVE-2026-53667 — medium · npm/react-router
CVE-2026-53666 — medium · npm/react-router

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Sources: CISA KEV (public domain), OSV.dev & GitHub Advisory Database (CC-BY-4.0), FIRST EPSS, NVD/CWE (public domain). Served live from the Stateward advisory database.