What the Official Notes Cover
The Modern Warfare 4 launch patch notes on the Call of Duty site (published October 25, 2026 by Infinity Ward) include a pre-launch list of DMZ bug fixes, grouped by the day they were addressed: October 20 and October 21. This article summarizes that list in our own words. The notes are the source of record, and nothing here goes beyond what they state.
Addressed on October 20: stability, soft locks and the FOB
- Various crashes and stability issues, including a crash when breaching the door in Breaking New Ground
- A soft lock when selling starting equipment, or dismissing Active Duty Operators carrying starting equipment, before a first deployment
- Selecting Untrack Recipe at the 3D Printer with no recipes tracked could kick the player out of the FOB
- Players could not equip an Active Duty Operator in their Showcase
- Shadows popping in and out while moving around the FOB
- The tablet screen could fail to turn on after searching the crashed drone in Breaking New Ground
Addressed on October 20: progression, missions and Orders
- The After-Action Report could show 0 XP earned after a player's first match
- Players could get double completion credit for story missions
- In a squad, only the player who landed the final blow on a Commander received XP and King Slayer Calling Card progress
- Some DMZ Orders description text was incorrect
Addressed on October 20: weapons, gear and traits
- The ISO Apex Attachment did not work as intended in DMZ
- The Gunsmith Attachment menu could stay stuck onscreen during deployment
- On Nintendo Switch 2, players could not purchase saved Blueprint modifications
- The Impact Smokes Pro Trait did not activate when a player was downed
Addressed on October 20: enemy AI, Dynamic Operations and Hajin
- Enemy AI could move into unintended areas when a player was downed during Breaking New Ground
- Enemy AI could run over players while infilling
- Some "find the keypad codes in safes" Dynamic Operations could appear in locked spaces
- On Nintendo Switch 2, a missing prompt could block progress on the Chemical Denial Dynamic Op at NuriGO Mall
- Some areas of Hajin where players could get stuck in rocks
Addressed on October 21
- An error when opening the Dog Tag Case
- The Toxic Intercept Op could fail after completing the Defend the Bomb objective
- A PC performance issue when holding a Heartbeat Sensor with a weapon equipped
- Enemy AI could run over players during infiltration in NK Wilderness
- Dynamic Operations text could display incorrectly at the Larger and Largest menu text sizes
- The Orders rewards section of the End Game Report could appear in low resolution
- Some unintended voice lines during Breaking New Ground
DMZ launched October 23, 2026 as part of Call of Duty: Modern Warfare 4. Early Access opened October 20 for a digital pre-order or pre-purchase of the Standard Digital or Vault Edition.
Sources: Infinity Ward, "Call of Duty: Modern Warfare 4 Launch Patch Notes" (October 25, 2026): callofduty.com.