You Do Need power plug adapter while traveling from Cape Verde to Malawi.

Here is Why You Need An Adapter

The outlet and plug type used in Malawi is G and in Cape Verde are C and F. This is how they look like.

Cape Verde

In Cape Verde, outlets of type C and F are in use.

Type C

Type F

Malawi

In Malawi, outlets of type G are in use.

Type G