We can’t provide an exact answer for countries where CBD is considered illegal or semi-legal. This is because everything depends on whether the particular airport security agent decides to check your luggage, whether he finds the CBD, and knows what it is made from. All we can tell you is how risky/dangerous it is to bring CBD into the given country based on their current marijuana/CBD laws.
More human studies are needed to fully understand the range of risks and side effects that CBD oil may cause. Studies of CBD oil aren’t common. This is partially because Schedule 1 substances like cannabis are highly regulated, causing some obstacles for researchers. With the legalization of marijuana products, more research is possible, and more answers will come.