CVE•Published 2026-06-02•Modified 2026-06-04•0 articles on news•6 live references•NVD data

CVE-2026-42342Shopify · React-router

Vulnerability data via NVD (ingested)

CVSS v3.1

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS percentile

Exploit Prediction Scoring System · top 84% of all CVEs

Weaknesses (CWE)

CWE-400Uncontrolled Resource Consumption

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.

Timeline

Published 2026-06-02

Modified 2026-06-04

External references

NVD MITRE Exploit-DB GitHub PoC Sploitus VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).

Shodan · vuln tag0 hosts

vuln:CVE-2026-42342

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product

product:"Shopify React-router"

All exposed Shopify React-router instances — cross-reference with the CVE's affected-version range.

Shodan · banner/body mention

http.html:"React-router"

HTTP body or banner mentions "React-router" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2026-42342