Nintendo Switch 2 Gets a Software Jailbreak, but It Comes With Real Limits

The Nintendo Switch 2 has been hacked, but there's a catch. Someone has released a software jailbreak that runs on real Switch 2 hardware, with no mod chip and no soldering. According to the developer, it even works on firmware 23.0.1. You still can't install Atmosphere and turn your Switch 2 into a fully modded console. Not yet.

To show it off, Mario Kart World has been modified so Peter Griffin and Hatsune Miku appear in the game. This isn't an emulator. It's happening on an actual Switch 2. Below, I'll cover what was hacked, what you can do with it, and whether you should update your Switch 2 to try it. Another developer is already working on possible alternatives, and you don't want to make the wrong decision here.

NS2JB reaches deeper into the Switch 2 than earlier exploits

The exploit is called NS2JB, and it comes from a security researcher. His technical writeup is dated October 18th, and by October 22nd the exploit was making headlines across the homebrew community. We've seen Switch 2 exploits before, but this one is definitely different. Instead of only running custom code inside a game, it manages to reach much deeper into the console's operating system. That's a pretty big deal.

The craziest part is how it was discovered. Everything starts with an original Nintendo Switch application, SmileBASIC 4. It's a programming app that lets you create your own little games, and because the Switch 2 supports original Switch software, it also runs on Nintendo's newer console. The researcher found a security vulnerability inside this app that allowed him to access memory he normally shouldn't be able to touch.

That alone wasn't enough. Normally, games are isolated from the rest of the console, so even if you hack one game, you can't take over the entire system. The researcher combined this with another vulnerability inside the Switch 2's file system module. This is where things get very interesting, because that module has access to important parts of the system that normal games don't. By exploiting it, he got the Switch 2 to run custom code with much higher permissions, all without opening the console or installing any hardware modification.

Custom characters in Mario Kart World show what the access allows

So what can you do with that? The developer decided to demonstrate it in probably the funniest way possible: by modifying Mario Kart World. We're talking about a Switch 2 exclusive game running on real hardware. While that's hilarious, the important part isn't the characters themselves. It's what this demonstrates.

According to the developer, this new access could allow homebrew applications, game modifications, save backups, and much deeper research into the Switch 2's system software. Those are things that were previously much harder to achieve.

AI tools helped, but they didn't hack the Switch 2 on their own

There's another interesting part to the story: artificial intelligence helped make it happen. The developer used OpenAI Codex to assist with finding vulnerabilities, writing code, and testing different approaches. He even built a setup with two Switch consoles, capture devices, and a little mechanism that could automatically press the power button whenever a console crashed. That's hilarious to me, because apparently, when you're trying to jailbreak Nintendo's newest console, crashing it over and over again is part of the process.

Before people start saying AI completely hacked the Switch 2 on its own, that's not what happened. The developer explained that this required around two weeks of substantial work, and the fully automated attempt didn't succeed. Still, it's pretty fascinating to see AI tools being used alongside human security research to achieve something like this.

The jailbreak works on 23.0.1 but is tethered and experimental

Here's what everyone wants to know: can you jailbreak your Switch 2 now? Yes and no. The exploit has been released, and according to the developer, it works on firmware 23.0.1. But this is not a complete custom firmware solution. You can't simply install Atmosphere, run all your favorite homebrew applications, or expect everything you'd get from a fully modded original Switch. At least not yet.

The exploit is also tethered, meaning it doesn't survive a normal reboot. Every time you restart the console, you'd have to run it again. The current public method requires a compatible version of SmileBASIC and a computer connected to the same local network. So this is still very much an experimental jailbreak intended for developers and experienced users.

Don't update an older Switch 2 just to get SmileBASIC 4

This is the most important point. If your Switch 2 is on older firmware, do not update your console just because you want to download SmileBASIC 4. I know some of you are probably thinking about updating to the newest firmware so you can access the eShop and grab the game before Nintendo removes it. They already did. That shows how serious the situation is.

Just because this exploit works on the latest firmware doesn't mean updating is a good idea. Older firmware versions could potentially become much more valuable for future exploits.

Another known developer in the console hacking scene has also been looking into this. He specifically pointed out that SmileBASIC 4 is not strictly necessary, and there's interest in using other games or entry points instead. That doesn't mean there's already a fully working public replacement you can download today, but it does mean this might not be limited to one specific game forever. That's exactly why I wouldn't recommend updating an older Switch 2 just to get SmileBASIC. You could end up losing access to a future vulnerability for something that might eventually work through a completely different game. If you're interested in Switch 2 homebrew, don't panic, don't rush into updating, and definitely don't assume you need to buy one specific application immediately.

Why I think this is a big step even without Atmosphere

If we still don't have Atmosphere or a complete jailbreak, why is everyone so excited? Because this is a massive step towards understanding how the Switch 2 works. Developers now have a way to investigate important system components, experiment with native code, and potentially discover additional vulnerabilities. The more researchers learn about the system, the more possibilities open up for future homebrew and custom firmware development.

Look at what's happening with other consoles. We've seen emulators on the Switch, the PS5 is getting something like seven emulators in a single week, and new hacks and jailbreaks keep coming out thanks to hardworking developers, now with AI helping speed things up. With this new level of access to the Switch 2, developers can finally start digging into what's inside the console.

The original developer is even interested in exploring whether the exploit could eventually be triggered through something like the browser instead of SmileBASIC. Again, that's future research, not something that's already available, and nobody can promise when or even whether we'll get full Switch 2 custom firmware. I plan to do a deeper dive into this exploit and try it on my own console too.

Still, think about how crazy this is. An application originally made for the first Nintendo Switch became the starting point for hacking Nintendo's newest console. We're already seeing custom characters in Mario Kart World, developers are investigating alternative entry points, and the homebrew community suddenly has a lot more to work with. That's some serious progress, and I'm really confident we're going to be eating good over the next few months.