Next.js: Middleware / Proxy bypass in App Router applications using Turbopack and single locale
High-risk advisory
CVE-2026-64642
Summary
Next.js: Middleware / Proxy bypass in App Router applications using Turbopack and single locale
Why it matters
GitHub has published a reviewed security advisory for next. Prioritize it with other application dependency updates.
Operator check
Check whether next is present in application dependency manifests, lockfiles, or build images. Review the GitHub advisory and upgrade to a patched version where available. CVSS score: 8.3.
Sources
PatchBrief uses public sources. It does not scan environments, verify exposure, or replace vendor guidance.