Disease on plant
These are spindle galls (sometimes called finger galls), which are produced by tiny insects. The do not seriously affect the health of trees and shrubs, and chemical control is usually not recommended. You could prune out and discard the leaves that are most heavily affected. If the plants are otherwise healthy, they typically outgrow the damage later in the season. Here is additional information about galls:
The plant is completely covered with them. Will it likely survive anyway? And thanks for your speeder espouse.
It should be fine.
You can already see unaffected new growth on the branch tips.