Impact Score: 5/10
Next.js v15.5.16 — Release Notes & Engineering Impact
Source available — automated, not human-reviewed
Component: nextjs · Channel: stable. Automated analysis, not a compatibility certification. How this works.
Analysis updated: 2026-11-01.
⚡ Executive Summary (TL;DR)
Next.js v15.5.16. Source highlight: This release contains security fixes for the following advisories:
Who Does This Impact? (Role-Based Analysis)
💻 Software Engineers & Devs
Check the source notes against the package and APIs you use before upgrading.
📊 Product & Engineering Leads
Use the documented changes to assess relevance to your product; release frequency alone is not a quality measure.
⚙️ DevOps & Security
Verify the target version, runtime requirements and rollback procedure in the official documentation.
📄 View Raw Release Notes (Original Developer Log)
This release contains security fixes for the following advisories:
High:
- [GHSA-8h8q-6873-q5fj: Denial of Service with Server Components](https://github.com/vercel/next.js/security/advisories/GHSA-8h8q-6873-q5fj)
- [GHSA-267c-6grr-h53f: Middleware / Proxy bypass in App Router applications via segment-prefetch routes](https://github.com/vercel/next.js/security/advisories/GHSA-267c-6grr-h53f)
- [GHSA-mg66-mrh9-m8jx: Denial of Service via connection exhaustion in applications using Cache Components](https://github.com/vercel/next.js/security/advisories/GHSA-mg66-mrh9-m8jx)
- [GHSA-492v-c6pp-mqqv: Middleware / Proxy bypass through dynamic route parameter injection](https://github.com/vercel/next.js/security/advisories/GHSA-492v-c6pp-mqqv)
- [GHSA-c4j6-fc7j-m34r: Server-side request forgery in applications using WebSocket upgrades](https://github.com/vercel/next.js/security/advisories/GHSA-c4j6-fc7j-m34r)
- [GHSA-36qx-fr4f-26g5: Middleware / Proxy bypass in Pages Router applications using i18n](https://github.com/vercel/next.js/security/advisories/GHSA-36qx-fr4f-26g5)
Moderate:
- [GHSA-ffhc-5mcf-pf4q: Cross-site scripting in App Router applications using CSP nonces](https://github.com/vercel/next.js/security/advisories/GHSA-ffhc-5mcf-pf4q)
- [GHSA-gx5p-jg67-6x7h: Cross-site scripting in beforeInteractive scripts with untrusted input](https://github.com/vercel/next.js/security/advisories/GHSA-gx5p-jg67-6x7h)
- [GHSA-h64f-5h5j-jqjh: Denial of Service in the Image Optimization API](https://github.com/vercel/next.js/security/advisories/GHSA-h64f-5h5j-jqjh)
- [GHSA-wfc6-r584-vfw7: Cache poisoning in React Server Component responses](https://github.com/vercel/next.js/security/advisories/GHSA-wfc6-r584-vfw7)
Low:
- [GHSA-vfv6-92ff-j949: Cache poisoning via collisions in React Server Component cache-busting](https://github.com/vercel/next.js/security/advisories/GHSA-vfv6-92ff-j949)
- [GHSA-3g8h-86w9-wvmq: Middleware / Proxy redirects can be cache-poisoned](https://github.com/vercel/next.js/security/advisories/GHSA-3g8h-86w9-wvmq)