A few days ago, I was checking my email like usual and saw a message from Vercel.
It said something about a critical vulnerability in React Server Components (RSC) affecting Next.js.
Honestly, I ignored it at first.
But later, when I opened my Vercel dashboard, a warning popped up again.
That’s when I realized this might be serious, so I decided to check my projects.
Some of my apps were safe.
Some were not.
So I opened ChatGPT and pasted the message from Vercel, asking what exactly this issue was and whether my apps were affected.
Surprisingly, the fix was very simple.
What was the issue? (Explained in simple words)
There was a critical security problem found in React Server Components (RSC).
This affects:
- React 19 (early versions)
- Next.js 15 and 16
- Some Next.js canary builds
- Tools that use RSC internally
Under some conditions, attackers could execute dangerous code on the server using crafted requests.
So even if your app looked normal, it might be open to a hidden security risk.
How I checked if my projects were affected
I just opened my package.json file and checked these versions:
nextreactreact-dom
One of my projects was using:
These versions were affected.
Another project was on:
That one was not affected, because React 18 is safe and that Next.js version doesn’t use the vulnerable system.
How I fixed it (literally one command)
ChatGPT suggested upgrading to the patched versions:
I ran it.
The build worked.
The warning disappeared.
Issue fixed.
That’s all.
No code changes.
No configuration changes.
Just an update.
What I learned
Sometimes we ignore technical emails thinking they’re not urgent.
But this one was important.
Also, keeping dependency versions updated is one of the easiest ways to avoid big security risks.
And honestly, using AI tools saved me hours of digging through documentation.
Final thought
If you’re using Next.js, especially version 15 or 16, or React 19, check your project once.
You may only need to run a simple update command to secure it.
