CVE-2025-32421

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.

We have discovered 464 live websites that are affected by CVE-2025-32421.

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Affected Software

Product	Next.js
Category	Web Application Frameworks
Vulnerable Domains	464 live websites (100% of Next.js install base)
Vulnerable Versions	from 0 through 14.2.24 from 15 through 15.1.6
Vulnerable Versions Count	15 versions ( 100% of all versions)