Activision Revamps Call of Duty Networking to Kill Wallhacks in Modern Warfare 4

Activision is fundamentally altering how Call of Duty handles backend networking in Modern Warfare 4 to combat the rampant use of wallhacks. The new framework relies on Server Culling to utilize occlusion layers within the game environments. Instead of trusting the client with full map state, the server will intentionally withhold enemy coordinate data from the player's hardware entirely if the opponent is hidden behind cover. The networking overhaul goes live on October 23, 2026, and will be active across all launch maps, Warzone, and the new Combat Outpost mode. "Cheat software can’t reveal information it never receives. When a player shouldn’t be able to know where an opponent is, the server can now withhold that opponent’s location data from their hardware." — Call of Duty team