Next.js Changelog

[!NOTE] This release contains security fixes and backported bug fixes. It does

Security Fixes

The following advisories have been addressed:

High:

• GHSA-8h8q-6873-q5fj: Denial of Service with Server Components
• GHSA-267c-6grr-h53f: Middleware / Proxy bypass in App Router applications via segment-prefetch routes
• GHSA-26hh-7cqf-hhc6: Middleware / Proxy bypass in App Router applications via segment-prefetch routes - Incomplete Fix Follow-Up
• GHSA-mg66-mrh9-m8jx: Denial of Service via connection exhaustion in applications using Cache Components
• GHSA-492v-c6pp-mqqv: Middleware / Proxy bypass through dynamic route parameter injection
• GHSA-c4j6-fc7j-m34r: Server-side request forgery in applications using WebSocket upgrades
• GHSA-36qx-fr4f-26g5: Middleware / Proxy bypass in Pages Router applications using i18n

Moderate:

• GHSA-ffhc-5mcf-pf4q: Cross-site scripting in App Router applications using CSP nonces
• GHSA-gx5p-jg67-6x7h: Cross-site scripting in beforeInteractive scripts with untrusted input
• GHSA-h64f-5h5j-jqjh: Denial of Service in the Image Optimization API
• GHSA-wfc6-r584-vfw7: Cache poisoning in React Server Component responses

Low:

• GHSA-vfv6-92ff-j949: Cache poisoning via collisions in React Server Component cache-busting
• GHSA-3g8h-86w9-wvmq: Middleware / Proxy redirects can be cache-poisoned

Core Changes

• fix: preserve HTTP access fallbacks during prerender recovery (#92231)
• Fix fallback route params case in app-page handler (#91737)
• Fix invalid HTML response for route-level RSC requests in deployment adapter (#91541)
• Patch setHeader for direct route handlers (#93101)
• Include deployment id in
• Fix double-encoding of URL pathname parts in client param parsing (#93491)

This release contains security fixes for the following advisories:

High:

• GHSA-8h8q-6873-q5fj: Denial of Service with Server Components
• GHSA-267c-6grr-h53f: Middleware / Proxy bypass in App Router applications via segment-prefetch routes
• GHSA-26hh-7cqf-hhc6: Middleware / Proxy bypass in App Router applications via segment-prefetch routes - Incomplete Fix Follow-Up
• GHSA-mg66-mrh9-m8jx: Denial of Service via connection exhaustion in applications using Cache Components
• GHSA-492v-c6pp-mqqv: Middleware / Proxy bypass through dynamic route parameter injection
• GHSA-c4j6-fc7j-m34r: Server-side request forgery in applications using WebSocket upgrades
• GHSA-36qx-fr4f-26g5: Middleware / Proxy bypass in Pages Router applications using i18n

Moderate:

• GHSA-ffhc-5mcf-pf4q: Cross-site scripting in App Router applications using CSP nonces
• GHSA-gx5p-jg67-6x7h: Cross-site scripting in beforeInteractive scripts with untrusted input
• GHSA-h64f-5h5j-jqjh: Denial of Service in the Image Optimization API
• GHSA-wfc6-r584-vfw7: Cache poisoning in React Server Component responses

Low:

• GHSA-vfv6-92ff-j949: Cache poisoning via collisions in React Server Component cache-busting
• GHSA-3g8h-86w9-wvmq: Middleware / Proxy redirects can be cache-poisoned

[!NOTE] This release contains security fixes and backported bug fixes. It does

Security Fixes

The following advisories have been addressed:

High:

• GHSA-8h8q-6873-q5fj: Denial of Service with Server Components
• GHSA-267c-6grr-h53f: Middleware / Proxy bypass in App Router applications via segment-prefetch routes
• GHSA-mg66-mrh9-m8jx: Denial of Service via connection exhaustion in applications using Cache Components
• GHSA-492v-c6pp-mqqv: Middleware / Proxy bypass through dynamic route parameter injection
• GHSA-c4j6-fc7j-m34r: Server-side request forgery in applications using WebSocket upgrades
• GHSA-36qx-fr4f-26g5: Middleware / Proxy bypass in Pages Router applications using i18n

Moderate:

• GHSA-ffhc-5mcf-pf4q: Cross-site scripting in App Router applications using CSP nonces
• GHSA-gx5p-jg67-6x7h: Cross-site scripting in beforeInteractive scripts with untrusted input
• GHSA-h64f-5h5j-jqjh: Denial of Service in the Image Optimization API
• GHSA-wfc6-r584-vfw7: Cache poisoning in React Server Component responses

Low:

• GHSA-vfv6-92ff-j949: Cache poisoning via collisions in React Server Component cache-busting
• GHSA-3g8h-86w9-wvmq: Middleware / Proxy redirects can be cache-poisoned

Core Changes

• fix: preserve HTTP access fallbacks during prerender recovery (#92231)
• Fix fallback route params case in app-page handler (#91737)
• Fix invalid HTML response for route-level RSC requests in deployment adapter (#91541)
• Patch setHeader for direct route handlers (#93101)
• Include deployment id in
• Fix double-encoding of URL pathname parts in client param parsing (#93491)

This release contains security fixes for the following advisories:

High:

• GHSA-8h8q-6873-q5fj: Denial of Service with Server Components
• GHSA-267c-6grr-h53f: Middleware / Proxy bypass in App Router applications via segment-prefetch routes
• GHSA-mg66-mrh9-m8jx: Denial of Service via connection exhaustion in applications using Cache Components
• GHSA-492v-c6pp-mqqv: Middleware / Proxy bypass through dynamic route parameter injection
• GHSA-c4j6-fc7j-m34r: Server-side request forgery in applications using WebSocket upgrades
• GHSA-36qx-fr4f-26g5: Middleware / Proxy bypass in Pages Router applications using i18n

Moderate:

• GHSA-ffhc-5mcf-pf4q: Cross-site scripting in App Router applications using CSP nonces
• GHSA-gx5p-jg67-6x7h: Cross-site scripting in beforeInteractive scripts with untrusted input
• GHSA-h64f-5h5j-jqjh: Denial of Service in the Image Optimization API
• GHSA-wfc6-r584-vfw7: Cache poisoning in React Server Component responses

Low:

• GHSA-vfv6-92ff-j949: Cache poisoning via collisions in React Server Component cache-busting
• GHSA-3g8h-86w9-wvmq: Middleware / Proxy redirects can be cache-poisoned

[!NOTE] This release is backporting bug fixes. It does

Core Changes

• chore: Bump reqwest to 0.13.2 (Fixes Google Fonts with Turbopack for Windows on ARM64) (#92713)
• Turbopack: fix filesystem watcher config not applying follow_symlinks(false) (#92631)
• Scope Safari ?ts= cache-buster to CSS/font assets only (Pages Router) (#92580)
• Compiler: Support boolean and number primtives in next.config defines (#92731)
• turbo-tasks: Fix recomputation loop by allowing cell cleanup on error during recomputation (#92725)
• Turbopack: shorter error for ChunkGroupInfo::get_index_of (#92814)
• Turbopack: shorter error message for ModuleBatchesGraph::get_entry_index (#92828)
• Adding more system info to the 'initialize project' trace (#92427)

Credits

Huge thanks to @Badbird5907, @lukesandberg, @andrewimm, @sokra, and @mischnic for helping!

[!NOTE] This release is backporting security and bug fixes. For more information about the fixed security vulnerability, please see

Core Changes

• Ensure app-page reports stale ISR revalidation errors via onRequestError (#92282)
• Fix [Bug]: manifest.ts breaks HMR in Next.js 16.2 (#91981 through #92273)
• Deduplicate output assets and detect content conflicts on emit (#92292)
• Fix styled-jsx race condition: styles lost due to concurrent rendering (#92459)
• turbo-tasks-backend: stability fixes for task cancellation and error handling (#92254)

Credits

Huge thanks to @icyJoseph, @sokra, @wbinnssmith, @eps1lon and @ztanner for helping!

Please refer the following changelogs for more information about this security release:

https://vercel.com/changelog/summary-of-cve-2026-23869

[!NOTE] This release is backporting bug fixes. It does

Core Changes

• backport: Move expanded adapters docs to API reference (#92115) (#92129)
• Backport: TypeScript v6 deprecations for baseUrl and moduleResolution (#92130)
• [create-next-app] Skip interactive prompts when CLI flags are provided (#91840)
• next.config.js: Accept an option for serverFastRefresh (#91968)
• Turbopack: enable server HMR for app route handlers (#91466)
• Turbopack: exclude metadata routes from server HMR (#92034)
• Fix CI for glibc linux builds
• Backport: disable bmi2 in qfilter #92177
• [backport] Fix CSS HMR on Safari (#92174)

Credits

Huge thanks to @nextjs-bot, @icyJoseph, @ijjk, @gaojude, @wbinnssmith, @lukesandberg, and @bgw for helping!