nextjs - 💡(How to fix) Fix next/font/google fails to build on 16.2.3 — Turbopack font resolution broken [1 comments, 2 participants]

Link to the code that reproduces this issue

https://github.com/vercel/next.js/issues

To Reproduce

1. Create any Next.js App Router project using next/font/google in app/layout.tsx
2. Use fonts like Ubuntu and Rubik with weight arrays and CSS variables
3. Build successfully on Next.js 16.1.7
4. Upgrade to Next.js 16.2.3 (npm install [email protected])
5. Run npm run build
6. Build fails with font resolution errors

Font configuration in layout.tsx:

import { Ubuntu, Rubik } from 'next/font/google'

const ubuntu = Ubuntu({ weight: ['300', '400', '500', '700'], subsets: ['latin'], variable: '--font-ubuntu', display: 'swap', })

const rubik = Rubik({ weight: ['300', '400', '500', '700'], subsets: ['latin'], variable: '--font-rubik', display: 'swap', })

Current vs. Expected behavior

Expected: Build succeeds, as it does on 16.1.7.

Actual: Build fails with multiple errors:

• Failed to fetch 'Rubik' from Google Fonts
• Can't resolve '@vercel/turbopack-next/internal/font/google/cssmodule.module.css'
• http2 feature is not enabled during font/CSS resolution

This also reproduced on 16.2.2. I am upgrading specifically to patch CVE-2026-23869 (CVSS 7.5, DoS via Server Components). There is no 16.1.x backport — 16.2.3 is the only available fix for the 16.x line. This means projects using next/font/google cannot patch a HIGH severity CVE without breaking their build.

Provide environment information

Operating System:
  Platform: win32
  Arch: x64
  Version: Windows 11
Binaries:
  Node: 22.20.0
  npm: 10.9.3
Next.js: 16.2.3 (fails), 16.1.7 (works)
Deployment: Vercel Pro

Which area(s) are affected? (Select all that apply)

Font (next/font)

Which stage(s) are affected? (Select all that apply)

next build (local)

Additional context

Deployed on Vercel Pro. Issue reproduces locally on Windows 11. Not browser-specific — build fails before the app can start. Same regression was present in 16.2.2. The 16.2.3 changelog mentions Turbopack fixes but the font resolution issue persists.