// v2.4.1 — Fabric 1.21.1 → 1.21.11 Stable

The exploit
toolkit for
Minecraft.

// DupeGUI is the definitive platform for bug hunting, item duplication,
and packet-level manipulation — built for technical players who go
deeper than the game intends.

⬇ Download v2.4.1 → Explore modules
duped.me / dupegui 2025
Bug Hunting /// Item Duplication /// Packet Manipulation /// Inventory Desync /// NBT Injection /// Entity Exploit /// Server-Side Bypass /// Replay Logger /// Bug Hunting /// Item Duplication /// Packet Manipulation /// Inventory Desync /// NBT Injection /// Entity Exploit /// Server-Side Bypass /// Replay Logger ///

// Core capabilities

What DupeGUI
lets you do.

Every module is built with precision and tested across dozens of server configurations and Minecraft versions.

01
🐛

Bug Hunter Suite

Automated scanning and detection of reproducible bugs across all game systems. Logs exact conditions, ticks, and server responses for reliable reports.

02
♾️

Item Duplication Engine

A library of known dupe vectors — chest minecart glitches, inventory desync, gravity block stacking — organized by version and server type.

03
📦

Packet Interceptor

Intercept, inspect, modify, and replay any C2S or S2C packet in real time. Full NBT editing and binary-level control via an intuitive GUI panel.

04
🔁

Session Replay

Record entire play sessions at the packet level. Replay specific segments, diff two sessions, and pinpoint exactly when an exploit window opens.

05
🧩

NBT Injector

Craft and inject arbitrary NBT into items, entities, and block entities. Bypass client-side validation and push non-standard data directly to the server.

06
📊

TPS & Desync Monitor

Real-time server TPS graphing with lag-spike detection. Automatically flags desync windows for duplication timing and rollback exploitation.

120+
Dupe Methods Catalogued
1.21.x
1.21.1 → 1.21.11 Fabric Only
38ms
Avg. Packet Intercept Latency
100%
Open Source

// Workflow

How it works.

01

Install the Fabric mod

Drop the DupeGUI .jar into your Fabric mods folder. Compatible with Fabric API 0.100+. Optifine not supported — use Sodium instead for best performance.

02

Open the GUI in-game

Press the default keybind (G) to open the DupeGUI overlay. All modules, settings, and active sessions are accessible from a single tabbed interface.

03

Select your module & configure

Pick a module — Bug Hunter, Packet Interceptor, Dupe Library, etc. Configure parameters for your target server type, game version, and desired output.

04

Execute and log results

Run the exploit or scan. Results are logged with full packet context, timestamps, and reproducibility scores. Export to JSON, plain text, or share directly to the DupeGUI community.

// Live packet inspection

Inspect every
byte.

The Packet Interceptor captures all C2S and S2C traffic, lets you freeze, modify, and replay them — in real time, with full NBT tree editing.

→ See all features
dupegui — packet log
$dupegui intercept --mode live --filter inventory
[INFO] Fabric hook active — intercepting C2S + S2C
[INFO] Filter: INVENTORY | SESSION: smp.hypixel.net

[0x0F] → C2S ClickContainerPacket
  slotId: 36 | mode: PICKUP | button: 0
  changedSlots: {36: diamond_sword×1}
[0x0F] ✓ passed — no anomaly

[0x11] → C2S SetCarriedItemPacket
  slot: 0
[0x11] ✓ passed

[0x0F] → C2S ClickContainerPacket (MODIFIED)
  slotId: 36 | mode: QUICK_MOVE | count: 64
[0x0F] ⚠ DESYNC DETECTED — inventory out of sync
  → DUPE WINDOW: ~120ms — exploitable on TPS < 18

$

// Module library

Every tool,
one interface.

All modules ship with the base mod. No additional downloads, no subscriptions.

Core
Packet Interceptor
Real-time C2S/S2C interception with NBT editor, packet freeze, replay, and traffic export.
Exploit
Dupe Library
120+ documented dupe methods with version tags, server compatibility, and success rate data.
Core
Bug Hunter
Automated game-state scanning with reproducibility scoring and structured bug report output.
Network
Desync Monitor
Detects client–server state mismatches in inventory, position, and entity data in real time.
Utility
Session Recorder
Full packet-level session recording with frame-accurate scrubbing and diff comparison.
Exploit
NBT Injector
Craft and inject arbitrary NBT data into items, blocks, and entities with full tree editing.
Network
TPS Tracker
Live server TPS graph with lag spike detection and automated dupe-window flagging.
Utility
Macro Engine
Automate multi-step exploit sequences with tick-precise packet timing and conditional branching.

// Get started

Download DupeGUI.

Free and open source. Supports Fabric 1.21.1 through 1.21.11 — Fabric Loader 0.15+ and Fabric API 0.100+ required.

1.21.1
1.21.2
1.21.3
1.21.4
1.21.5 – 1.21.11
⬇ DupeGUI-2.4.1-fabric-1.21.1.jar

SHA256: a3f8c2d14e77b09a21cc56fe89da037b5f4e112cd8930a7bb6e14207c3990f8d