Next.js: שלושה תיקוני אבטחה שכדאי לבדוק לפני הפריסה הבאה

Read this news or bug-fix article as reference material:
https://nethanelfitoussi.com/article/nextjs-october-2026-security-update?lang=en

Goal: apply the documented workflow to my development project.
Read the existing project instructions, inspect the relevant files and explain the smallest useful setup.

Use the article and its examples as references. Identify any missing project files before making changes.

If I have not supplied a project folder, ask which development project to use. Do not invent a repository URL.

Additional project setup instructions:
Audit my Next.js project against https://nextjs.org/blog/nextjs-security-update-october-14-2026 and its three linked vendor advisories. Inventory exact locked and deployed next, react, react-dom and sharp versions. Check Cache Components/use cache functions returning multiple typed arrays, SVG Image Optimization on glibc Linux, and App Router Server Actions separately. Plan an upgrade to at least next 16.4.1 on the 16 line or 15.5.28 on the 15 line, or a later confirmed patched compatible release. Updating sharp alone only addresses the image issue, not the other advisories. Respect the existing lockfile and package manager. Propose local changes, build and regression checks, and a rollback plan. Do not infer compromise from an affected version. Stop before production deployment.

Check the dated advisory and current official vendor guidance. Identify whether my installed version and configuration are affected before proposing a fix.

Give me a short plan, then make the agreed local changes and run the relevant checks. Report actual results and anything not verified. Stop before credentials, paid services, production changes, push, merge or deployment.