# Next.js v15.5.18 — Release & Upgrade Intelligence
- **Product:** Next.js (https://nextjs.org)
- **Version:** v15.5.18
- **Released:** May 07, 2026
- **Impact Score:** 5/10
- **Breaking Changes:** Not verified
- **Canonical Analysis:** https://changelogs.us/nextjs/updates/v15.5.18/

## Executive Summary (TL;DR)
Next.js v15.5.18. Source highlight: This release contains security fixes for the following advisories:

## Bug Fixes
- GHSA-26hh-7cqf-hhc6: Middleware / Proxy bypass in App Router applications via segment-prefetch routes - Incomplete Fix Follow-Up

## Upgrade Command
```bash
npm install --save-exact next@15.5.18
```