If you run a serious community, disable client-side pasting entirely. Force players to upload dupes to a server queue that sanity-checks prop counts and constraint links.
These tools detect anomalous spawning patterns, impossible constraint counts, and known crasher dupe signatures. Most result in a “global ban” shared across hundreds of servers via community blacklists. GMod’s also use SteamID-based bans.
On servers that run the popular addon, crashers can save dupes containing complex microcontrollers (Expression 2 or E2 chips). If the server’s E2 settings are poorly configured, an injected dupe can execute a script that forces an infinite loop, crashing the server lua environment. The Impact on the Garry's Mod Community
Exploiters use several primary vectors within the GMod building environment to turn harmless dupes into server-killing weapons. 1. Physics Engine Overload (Ragdoll and Prop Spikes)
Don't say I didn't warn you...
Or worse, a function that creates thousands of networked entities, leading to a crash. While modern GMod has largely patched direct Lua injection via dupes, old servers running outdated addons remain vulnerable.
Garry's Mod, commonly referred to as GMOD, is a popular sandbox game that allows players to create and play custom game modes. The game's flexibility and creative freedom have made it a staple in the gaming community, with millions of players worldwide. However, like any online game, GMOD is not immune to cheating and exploits. One of the most notorious threats to GMOD servers is the "GMOD Server Crasher Dupe," a type of exploit that can bring down entire servers and cause chaos in online gaming communities.
The dupe uses advdupe2 with constraints disabled, pasting 8,000–15,000 individual props in a single frame. GMod’s spawning system isn’t designed for that volume. The server tries to assign network IDs, collision groups, and shadow meshes all at once.
If your server type (like DarkRP or Military RP) does not require advanced building, completely disable the Duplication and Weld tools for non-administrative ranks. Install Advanced Anti-Exploit Addons gmod server crasher dupe
Crasher dupes sometimes contain heavily glitched or nested advanced duplicator files that attempt to spawn more entities than the server can handle in a single tick, forcing an immediate buffer overflow. 3. Netchannel and Lua Script Exploits Advanced crasher dupes do not just rely on props.
sbox_maxprops 100 sbox_maxragdolls 0 sbox_maxeffects 0 sbox_maxdynamite 0 sbox_maxthrusters 5 sbox_maxwheels 5 Use code with caution. 2. Install a Modern Anti-Crasher Addon
Continuous downtime drives players away to more stable, secure competitors. How Server Owners Can Protect Their Servers
I just found a crazy server crasher dupe in Garry's Mod that can take down even the most stable servers. Introducing... PropBomb 2.0! If you run a serious community, disable client-side
: Community-made addons like Better Dupe replace the standard spawning logic with delayed prop creation to keep the server stable.
Set strict limitations to prevent excessive entity spawning:
The GMod developer community has created highly effective tools specifically engineered to detect and block malicious dupes before the server attempts to render them.
A sudden, vertical spike in CPU usage right before the crash. Most result in a “global ban” shared across