Is CVE-2026-42342 actively exploited?

No active exploitation of CVE-2026-42342 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-42342 be exploited remotely?

Yes. CVE-2026-42342 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-42342?

CVE-2026-42342 has a CVSS score of 7.5 (HIGH).

HOME VULNERABILITIESCVE-2026-42342

HIGH

CVE-2026-42342

CWE-400Published: June 2, 2026· Updated: Jun 4, 2026

7.5

CVSS v3.1

EPSS:0.05%probability of exploitation in 30 daysPercentile:16.3th

Official 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.

NVD Source

Technical Analysis

CVE-2026-42342 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.