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React Router's same-origin redirect with path starting // causes open redirect via protocol-relative URL reinterpretation

React Router's same-origin redirect with path starting // causes open redirect via protocol-relative URL reinterpretation

CVE-2026-40181Published 2 months agoUpdated 1 day agoSource: OSV

Affected packages

  • @remix-run/router
  • react-router

Exploit signal

Known exploited (CISA KEV)
No
EPSS score
0.16%
EPSS percentile
5.9%

EPSS is the probability a CVE is exploited in the wild; percentile is its rank among all CVEs. This advisory is in the top 6%.

Sources

Structured record: https://osv.dev/vulnerability/GHSA-2j2x-hqr9-3h42

Recommended response stack

Snyk — Scan your dependencies in CI and fix this vulnerability.→Socket — Detect malicious and compromised packages before they ship.→

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React Router's same-origin redirect with path starting // causes open redirect via protocol-relative URL reinterpretation | HackTribune