# Project Zomboid 42.20.4 STABLE & 42.19.2 UNSTABLE & 41.78.21 LEGACY Hotfixes Released

- Product: Project Zomboid (https://whatsnew.fyi/product/project-zomboid)
- Vendor: The Indie Stone
- Date: 2026-08-26
- Original notes: https://store.steampowered.com/news/app/108600/view/715662120170029187
- Permalink: https://whatsnew.fyi/product/project-zomboid/releases/2026-08-26-42.20.4-stable-42.19.2-unstable-41.78.21-legacy-h

What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog.

Reuse: the summaries, labels and curation here are © What's New. Quote freely with attribution and a link back; wholesale republication of the corpus is not permitted — terms: https://whatsnew.fyi/terms. The vendors' own release notes remain their publishers'.

---

- **security** — Fixed security vulnerabilities
- **removed** — Removed loadstring and loadstream methods from Lua API

While this update should not break saves, if you encounter any bugs please ensure you can replicate them on a fresh save with no mods installed before reporting them to our team (https://theindiestone.com/forums/forum/85-bug-reports/).

##### FIXES

- Fixed security vulnerabilities.

- Mod makers should be aware that as part of this fix, the loadstring and loadstream methods have been removed. If your mods used these methods you will need to update your mods. If you were using these methods to execute code sent from the server, then you will need to create the necessary methods and call them by sending the appropriate commands. If you are unable to replace these methods in your case, please report the issue in the #mod_portal channel of [The Official Project Zomboid Discord server](https://discord.gg/theindiestone), explaining how you were using them

_As always, discussions regarding this update can be found pinned to the Project Zomboid Discussions Forums (https://steamcommunity.com/app/108600/discussions/0/582806564883169058/)_.