eslint-config-next

This release contains additional security hardening for next/og. For more information, check out https://nextjs.org/blog/nextjs-security-update-september-22-2026

Follow-up release to v15.5.24 re-enabling AVIF Image Optimization when newer versions of sharp are installed (#97954).

This release contains security fixes for the following advisories:

Critical:

• Unauthenticated Remote Code Execution on windows-hosted servers
• Unauthenticated Remote Code Execution in Image Optimization API when AVIF files are used

What's Changed

• [15.x] Port ReplyServer traversal guards to FlightClient @eps1lon in https://github.com/vercel/next.js/pull/96405

Full Changelog: https://github.com/vercel/next.js/compare/v15.5.22...v15.5.23

What's Changed

• [15.5] Reject TypeScript >= 7.0 with an actionable error by @lukesandberg in https://github.com/vercel/next.js/pull/96110

Full Changelog: https://github.com/vercel/next.js/compare/v15.5.21...v15.5.22

This release contains security fixes for the following advisories:

High:

• Denial of Service in App Router using Server Actions
• Middleware / Proxy bypass in App Router applications using Turbopack and single locale
• Server-Side Request Forgery in rewrites via attacker-controlled destination hostname
• Server-Side Request Forgery in Server Actions on custom servers

Moderate:

• Cache confusion of response bodies for requests with bodies
• Cache confusion of response bodies for requests with bodies containing invalid UTF-8 byte sequences
• Denial of Service in the Image Optimization API using SVGs
• Unauthenticated disclosure of internal Server Function endpoints
• Unbounded Server Action payload in Edge runtime

Contains no changes except publishing @next/swc-wasm-web which was accidentally not published since 15.5.15.

[!NOTE] This release is backporting bug fixes. It does not include all pending features/changes on canary.

Core Changes

• [15.5.x] Don't drop FormData entries (#94244)

Other

• [15.5.x] Fix CI (#94281)

Credits

Huge thanks to @eps1lon for helping!

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

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

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 not include all pending features/changes on canary.

Core Changes

• feat(next/image): add lru disk cache and images.maximumDiskCacheSize (#91660)
• Fix(pages-router): restore Content-Length and ETag for /_next/data/ JSON responses (#90304)

Credits

Huge thanks to @styfle and @lllomh for helping!

[!NOTE] This release is backporting bug fixes. It does not include all pending features/changes on canary.

Core Changes

• fix: patch http-proxy to prevent request smuggling in rewrites (See: CVE-2026-29057)

Credits

Huge thanks to @ztanner for helping!

[!NOTE] This release is backporting bug fixes. It does not include all pending features/changes on canary.

• fix unlock in publish-native

This is a re-release of v15.5.11 applying the turbopack changes.

[!NOTE] This release is backporting bug fixes. It does not include all pending features/changes on canary.

Core Changes

• Tracing: Fix memory leak in span map (#85529)
• fix: ensure LRU cache items have minimum size of 1 to prevent unbounded growth (#89134)
• Turbopack: fix NFT tracing of sharp 0.34 (#82340)
• Turbopack: support pattern into exports field (#82757)
• NFT tracing fixes (#84155 and #85323)
• Turbopack: validate CSS without computing all paths (#83810)
• feat: implement LRU cache with invocation ID scoping for minimal mode response cache (#89129)

Credits

Huge thanks to @timneutkens, @mischnic, @ztanner, and @wyattjoh for helping!