ModsJava
Create: Schematic Checker
I don't know my version or loader
Open the Minecraft launcher and look at the profile you play on — it names both, like fabric-loader-1.21.4. The version also shows in the bottom-right corner of the game's main menu.
No loader in the profile name? Then it's plain Minecraft, and these mods won't run — you need Fabric or NeoForge installed first.
Create: Schematic Checker (CSC)
Create: Schematic Checker is a server-side protection mod for Create schematics. It scans uploaded schematics and blocks or sanitizes known malicious NBT patterns before they can be printed into a world.
CSC is designed for public and survival servers that allow schematic uploads. It protects against known Create schematic exploits such as item duplication, creative-item acquisition, server lag, crashes, malformed contraptions, and dangerous addon NBT.
Support
- Discord: https://discord.gg/rQV5JPauY7
What It Does
- Scans schematics asynchronously, without blocking the Minecraft server main thread.
- Detects and blocks known malicious Create schematic exploits.
- Sanitizes configurable NBT fields, tags, blocks, items, and entities.
- Validates Create belts, chain drives, mechanical arms, filters, fluid tanks, clipboards, and other high-risk block entities.
- Supports custom local rules through
config/CSC/user_rule.json. - Can optionally sync online rule updates when enabled by the server owner.
- Keeps logs and optional schematic backups for auditing and later investigation.
Supported Versions
Choose the build that matches both your Minecraft version and Create version.
| Loader | Minecraft | Create target |
|---|---|---|
| Forge | 1.14.4 | 0.2.3 |
| Forge | 1.15.2 | 0.3.1 |
| Forge | 1.16.5 | 0.3.2g |
| Forge | 1.17.1 | 0.4 |
| Forge | 1.18.2 | 0.5.1i |
| Forge | 1.19.2 | 0.5.1i |
| Forge | 1.20.1 | 0.5.1j |
| Forge | 1.20.1 | 6.0.x |
| Fabric | 1.18.2 | 0.5.1i |
| Fabric | 1.19.2 | 0.5.1i |
| Fabric | 1.20.1 | 6.0.x |
| Fabric | 1.21.1 | 6.0.x |
| NeoForge | 1.21.1 | 6.0.x |
Dependencies
- Minecraft
- Create
Some builds may require loader-specific Create dependencies such as Flywheel, Ponder, or Registrate, depending on the target Minecraft/Create version.
Installation
- Download the CSC jar for your loader, Minecraft version, and Create version.
- Put the jar into the server
modsfolder. - Start the server once to generate
config/CSC/config.toml. - Review the generated configuration before opening schematic uploads to players.
- Use
/csc reloadafter editing the config.
Configuration
Main config file:
config/CSC/config.tomlImportant options:
| Option | Purpose |
|---|---|
core.Enable |
Enables or disables CSC checks. |
core.BanBlock |
Blocks or sanitizes high-risk blocks and items. |
core.BanTag |
Removes or blocks dangerous NBT tags. |
core.KillEntity |
Removes entities from schematics to prevent entity-based exploits. |
core.WhiteListModEnable |
Allows only listed mod IDs to keep NBT. Recommended for public servers. |
debug.EnableBackup |
Saves uploaded schematics for later auditing. Recommended. |
online.enableAutoUpdate |
Allows CSC to fetch cloud rule updates. Disabled by default. |
online.enableManualConfig |
Enables custom rules from config/CSC/user_rule.json. |
Manual custom rule file:
config/CSC/user_rule.jsonOnline cached rules:
config/CSC/online/Commands
| Command | Description |
|---|---|
/csc |
Shows basic status. |
/csc help |
Shows help and feedback links. |
/csc reload |
Reloads CSC configuration and rules. |
/csc list |
Shows rule-list help. |
/csc list IdMatchRuleAll |
Lists all ID match rules. |
/csc list OperateMatchRuleAll |
Lists all NBT operation rules. |
/csc DisableTemp |
Temporarily disables checks for 5 minutes. |
/csc Enable |
Restores CSC after temporary disable. |
/csc notice whitelistid on|off |
Toggles whitelist-mode scan notice. |
/csc mode whitelistid on|off |
Toggles mod ID whitelist mode. |
Known Exploit Coverage
CSC covers many reported Create schematic vulnerabilities and addon-specific NBT exploits.
| # | Status | Issue |
|---|---|---|
| 1 | Fixed | Creative items printed through Lecterns or Clipboards. |
| 2 | Fixed | Valve data tampering causing cache overflow and memory leaks. |
| 3 | Fixed | Clipboard duplication and creative-property clipboards. |
| 4 | Fixed | Conveyor belt length tampering beyond 1000 blocks. |
| 5 | Fixed | Conveyor belts with -1 length crashing older Forge servers. |
| 6 | Fixed | Massive malicious conveyor chains causing lag, crashes, or world damage. |
| 7 | Fixed | Kintsugi Decor Urn infinite game-tick exploit. |
| 8 | Fixed | Weighted Ejector launch-force tampering. |
| 9 | Fixed | Oversized Filter NBT causing extreme tick lag. |
| 10 | Fixed | Overlong chain-drive pairings causing server lag. |
| 11 | Fixed | using_converts_to tag creative-item exploit. |
| 12 | Fixed | Mechanical Arm distance tampering. |
| 13 | Fixed | Chain drives targeting invalid positions. |
| 14 | Fixed | Distorted conveyor belts causing belt or shaft duplication. |
| 15 | Fixed | Chain drives with thousands of targets causing lag and duplication. |
| 16 | Fixed | Mechanical Arm infinite output through tampered safe-NBT data. |
| 17 | Fixed | Mechanical Arm duplication with camouflage panel mods. |
| 18 | Fixed | Filter retrieval through Andesite Hoppers. |
| 19 | Fixed | Creative-item acquisition through burn tags. |
| 20 | Fixed | Entity-based duplication and creative-item exploits, including Armor Stands. |
| 21 | Fixed | Roller-related creative item exploit in specific versions. |
| 22 | Fixed | Create: Enchantment Industry creative-tag printing. |
| 23 | Fixed | Create Crafts & Additions infinite energy-cell printing. |
| 24 | Fixed | Integrated Farming Chicken Coop GT lag exploit. |
| 25 | Fixed | Command-execution NBT exploit. |
| 26 | Fixed | Create 6.0+ fluid tank capacity tampering. |
| 27 | Fixed | Quark Wire Mesh infinite lava exploit. |
| 28 | Fixed | Item teleportation to the void through modified mechanical crafters/synthesizers. |
| 29 | Fixed | Additional void item-teleport exploit variants. |
| 30 | Fixed | Super Glue adhesion-check abuse causing heavy lag or crashes. |
| 31 | Fixed | Chassis and angled-chassis adhesion-check abuse causing heavy lag or crashes. |
| 32 | Detected | Create: Big Cannons fuse-data tampering for creative-item acquisition. |
| 33 | Fixed | Twilight Forest giant block printing bypassing terrain and breaking bedrock. |
Acknowledgments
Special thanks to:
- crackun24 for Mixin reference code.
- Qifei de Meigui, Kong Yu, air, crackun24, runner, CTR server owner, and other Create public server owners for test samples and post-fix support.
- Some CMS blueprint-site partner creators. Their decision to block the author after seeing schematic bug fixes also became part of the motivation to keep this project updated.
- Bilibili creator 一只不屑的屑蜘蛛. The repeated public-server schematic attacks and spread of exploit samples directly motivated this project and helped accelerate fixes for Create schematic vulnerabilities.
License
This project is licensed under GNU LGPL 3.0.
Quick facts
- Edition: Minecraft Java
- File type: .jar
- Minecraft versions listed: 1.21.1, 1.20.1, 1.19.2
- How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
- Where to get it: Opens on CurseForge — not every file is mirrored on our own servers.
Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.
Verified by MCModsHub
- Ships as CreateSchematicChecker-2.27.43-6.0-fabric-1.20.1.jar — drop this file into the mods folder
- Download size: 338 KB
- Download link checked 27 Aug 2026 — working
These come from our own check of the pack file, not from the source page.