What is the ruling on having wet dream or waking up in the state of janabah while observing fasting?

Having wet dream while fasting does not invalidate the fast and waking up as junub by delaying ghusl does not hinder fasting either (al-Fatawa al-Hindiyyah, I, 220) . However delaying ghusl until the end of fajr prayer’s time is a sinful act. Because in this situation, the fajr prayer will be unperformed (Ibn Abidin, Radd al-Muhtar, III, 372). It is also known that Prophet Muhammad (saw) had a bath after imsak in fajr prayer’s time in Ramadan (Bukhari, Sawm, 25).

Source: Presidency Of Religious Affairs The Turkey, High Board of Religious Affairs FATWAS,

Does Masturbation Invalidate Fasting?