CVE-2026-42342
7.5 · HIGHOverview
CVE-2026-42342 is a high-severity vulnerability affecting shopify react-router. It was published on June 2, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).
This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical Description
React Router is a router for React. In versions 7.0.0 through 7.14.x of react-router and versions 2.10.0 through 2.17.4 of @remix-run/server-runtime, certain crafted requests can consume disproportionate server resources via unbounded path expansion in the __manifest endpoint, resulting in response time degradation and/or service unavailability for end users. This affects React Router Framework Mode applications as well as Remix applications. This does not impact applications using Declarative Mode (`<BrowserRouter>`) or Data Mode (`createBrowserRouter/<RouterProvider>`). This is patched in react-router version 7.15.0 and @remix-run/server-runtime version 2.17.5.
Remediation
Check the references section for vendor advisories and patches from shopify. Update react-router to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| shopify | react-router | >= 7.0.0, < 7.15.0 | Affected |
| shopify | remix-run\/server-runtime | >= 2.10.0, < 2.17.5 | Affected |
Frequently Asked Questions
What is CVE-2026-42342?
CVE-2026-42342 is a high-severity vulnerability affecting shopify react-router. It was published on June 2, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).
How severe is CVE-2026-42342?
This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2026-42342?
Check the references section for vendor advisories and patches from shopify. Update react-router to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2026-42342?
CyberStrike's AI-powered security agents can automatically detect CVE-2026-42342 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
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