A software-only Switch 2 jailbreak now exists. Security researcher Sammy Hajhamid, who goes by pepsipu, published ns2jb on Oct. 18 for firmware 23.0.1. He calls it, to his knowledge, the first such exploit for the Switch 2.

What it does

Per the write-up, the exploit has these traits.

  • Code execution: it runs native code as an ordinary system service and as the built-in file-system service.
  • Uses listed in the post: homebrew, reverse engineering and modding games, backing up save files, and reaching hardware peripherals.
  • Tethered: it is software-only but tethered.
  • Not custom firmware: the post says he hopes it helps the homebrew community move toward custom firmware, which is not released.

The project's GitLab page says the demo targets firmware 23.0.1 and a specific SmileBASIC 4 version. It installs no custom firmware, and restarting the console restores the original state.

How it gets in

The entry point is SmileBASIC 4, a programming game made for the original Switch. Per the write-up, an integer overflow in its interpreter gives memory corruption. A buffer overflow in the file-system service's path handling then widens access. This article does not cover how to reproduce either step.

The AI part

Hajhamid says he ran several OpenAI Codex agents against the problem. His post describes a harness with two JetKVMs for controller input and video, plus a device that presses the power button over Bluetooth. He puts the work at about two weeks.

He also says in the same post that a Mario Kart World mod was "vibecoded" in a day, just for fun. The Verge also covered the story.

Why it matters

For most owners nothing changes today. The README's own run needed several fresh boots to succeed, a computer on the same network and over 20 MiB of free SmileBASIC save space, per the README. It is a developer demo, not an app.

Risk to your console is the practical issue. Nintendo's Switch user agreement says unauthorized modification or devices "may render the Console and/or Software permanently unusable." Whether Nintendo acts on this exploit is unknown.

The update tradeoff: the exploit targets firmware 23.0.1, so a later update could change whether it works, though we found no Nintendo statement on that. Skipping an update to keep a jailbreak working also means skipping whatever that update contains. Owners who want no part of this can update as normal.

Nintendo has not commented publicly on the jailbreak in anything we found, including its newsroom.

For other Switch 2 coverage, see SanDisk's 512GB microSD Express card deal and GameSir's G7 Pro 8K controller.