CVE-2025-32421: Vercel Next.js

Low severity, CVSS 3.7. EPSS: 0.8% chance of exploitation in the next 30 days.

Next.js is a React framework for building full-stack web applications. Versions prior to 14.2.24 and 15.1.6 have a race-condition vulnerability. This issue only affects the Pages Router under certain misconfigurations, causing normal endpoints to serve `pageProps` data instead of standard HTML. This issue was patched in versions 15.1.6 and 14.2.24 by stripping the `x-now-route-matches` header from incoming requests. Applications hosted on Vercel's platform are not affected by this issue, as the platform does not cache responses based solely on `200 OK` status without explicit `cache-control` headers. Those who self-host Next.js deployments and are unable to upgrade immediately can mitigate this vulnerability by stripping the `x-now-route-matches` header from all incoming requests at the content development network and setting `cache-control: no-store` for all responses under risk. The maintainers of Next.js strongly recommend only caching responses with explicit cache-control headers.

Affected products

• Vercel Next.js: before 14.2.24 (fixed in 14.2.24); from 15.0.0, before 15.1.6 (fixed in 15.1.6)

Published 2025-05-14. Last modified 2026-06-17.