Switch 2 23.5.0 closes the game escape the jailbreak relied on, OatmealDome says

The official notes

Version 23.5.0 went out on November 9 for Switch 2, and for the original Switch too. Nintendo's support page says the Switch 2 update adds accessibility settings to first-time setup, gets ready for eShop gifting between family group members (arriving with a shop update on November 17) and adds Portuguese (Portugal) to text to speech. Everything else falls under general adjustments. Security isn't mentioned at all.

What OatmealDome says

A day later OatmealDome wrote that the OS exploit used in the recent jailbreak is patched in 23.5.0, and that from this version you can no longer escape the game's environment. That's the chain Sammy "pepsipu" Hajhamid published in October: it gets in through SmileBASIC 4 or the Civilization VII cartridge, needs a PC attached and is gone after a reboot.

In the post, as quoted by My Nintendo News and Notebookcheck, dumping and modding games becomes impossible again on 23.5.0, with two possible exceptions: some cartridges released later on, and maybe game updates. Nintendo hasn't confirmed anything and pepsipu hasn't commented in public. The two sites also differ on one detail, one quoting Civilization VI and the other Civilization VII.

If your Switch 2 is on 23.0.1 or earlier and you want to keep using homebrew, don't install 23.5.0. Turn off automatic updates in the console settings.

Who can still use it

Anyone who hasn't updated keeps the jailbreak, since the fix only applies from 23.5.0. The trouble starts with games that require that version or later to launch. Anything already dumped from the console stays where it is after an update.

Original Switch

On the original Switch, 23.5.0 only brings eShop gifting and general fixes. Atmosphère 1.12.1, the latest release from October 16, added support for 23.0.0 and doesn't mention 23.5.0 yet. If you run CFW, wait for the project to announce support before updating.