What is CVE-2026-42342?

CVE-2026-42342 is a high-severity vulnerability in Remix-run React-router, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2026-06-02.

How severe is CVE-2026-42342?

High severity. CVSS v3 base score is 7.5 out of 10.

Resource exhaustion in Remix-run React-router

CVE-2026-42342

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…

Vulnerability class: DoS (Denial of Service)

EPSS: 0.001 (16.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Remix-run React-router — versions >= 7.0.0, < 7.15.0
Remix-run @Remix-run/server-runtime — versions >= 2.10.0, < 2.17.5
Shopify React-router
Shopify Remix-run\/server-runtime

Weakness classification (CWE)

CWE-400 — Uncontrolled Resource Consumption

References

security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)

Frequently asked questions

What is CVE-2026-42342?: CVE-2026-42342 is a high-severity vulnerability in Remix-run React-router, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2026-06-02.
How severe is CVE-2026-42342?: High severity. CVSS v3 base score is 7.5 out of 10.