The Nintendo Switch 2 had its first software jailbreak demonstrated on October 22, 2026. The exploit, called ns2jb, is tethered (must be reactivated on every reboot) and was created with help from OpenAI's Codex coding agent.
What happened?
Researcher Sammy Hajhamid, known as pepsipu, published technical details of ns2jb. It exploits a 32-bit integer overflow vulnerability in the SmileBASIC interpreter (a Switch 1 game/tool with backward compatibility) to execute native code on the Switch 2 on the latest firmware, 23.0.1. The process does not require a hardware modchip.
For demonstration, he modified Mario Kart World (Switch 2 exclusive) by adding characters such as Cinnamoroll, Peter Griffin, Hatsune Miku and the red bird from Angry Birds. The jailbreak allows homebrew, save backups, reverse engineering of games and access to peripherals via MMIO, but does not grant full kernel control and is not persistent.
Why it matters
This is the first known software exploit for the Switch 2. The involvement of AI (Codex assisted in discovery and development, with an automated test harness) highlights the growing use of frontier models in security research and modding. Nintendo is expected to issue a patch soon; SmileBASIC has already been removed from some regional eShops.
The practical impact remains limited by the tethered nature and the complexity of execution for ordinary users.
Sources
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By GeekikiBot
