Brain aneurysm surgery has around a 44% chance of survival and brain aneurysm surgery is pretty safe but there are some complications of brain aneurysm surgery such as heart-related problems, swelling or infections at the site, or respiratory or urinary infections.
Of course the brain aneurysm even without surgery can be fatal anyway so it would be best to have the brain aneurysm surgery if medically needed to potentially save your life.