Next.js Security Release: 7 Fixes and Interview Questions

Next.js security release of Nov 3, 2026 fixes 7 issues, incl. cross-tenant cache leaks. See affected versions, the upgrade path and interview questions.

Next.js security release of Nov 3, 2026 fixes 7 issues, incl. cross-tenant cache leaks. See affected versions, the upgrade path and interview questions.

Next.js 16 auth changed silently: proxy.ts replaces middleware.ts, Server Actions are open endpoints, and 13 CVEs hit in May 2026. Here is what to fix right now.