The Possible Reason Your Nespresso Vertuo Machine Is Leaking - Tasting Table
Briefly

Despite its higher cost, the Nespresso Vertuo has become a favorite for coffee lovers due to its quality brews, although it can suffer from blockage issues.
A blockage at the brewing head or outlet nozzle can cause slow coffee flow and overflow, often due to coffee grounds or limescale buildup.
Using a turkey baster filled with water can effectively clear blockages in the Nespresso Vertuo's system, making it a simple fix for users.
Regular cleaning and descaling of your Nespresso Vertuo is essential to prevent issues like blockages that lead to overflowing coffee.
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