Developer pepsipu has published a technical account of ns2jb, a claimed software-only, tethered Nintendo Switch 2 jailbreak that the developer says works on firmware 23.0.1. The writeup is dated Oct. 18, 2026. In an Oct. 22 post reproduced by VideoCardz, pepsipu presented a Mario Kart World mod adding characters including Cinnamoroll, Peter Griffin and Hatsune Miku.
According to the developer’s writeup, the exploit begins with an integer overflow in the interpreter for SmileBASIC, a Switch 1 application that runs on Switch 2. It then uses a path-normalization buffer overflow in fs, a filesystem system module. Pepsipu says the resulting access allows native code to run with ordinary system-module permissions and within fs, enabling homebrew, game modifications and save backups. The writeup links to an ns2jb GitLab repository.
The practical limits matter. VideoCardz reports that the method needs no modchip but does require a connected computer and reactivation after every restart. It does not provide full control of the Switch 2 operating system or persistent custom firmware. Pepsipu also writes that the team has no current route into built-in system modules other than fs and hopes the work will help the homebrew community move toward custom firmware.
Wccftech’s Francesco De Meo says the outlet watched a video of the modded Mario Kart World and checked the code repository. That is a narrower check than running ns2jb on a console.
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