DIBAL (diisobutylaluminum hydride) reduces nitriles to aldehydes

nitrilos-reduccion-aldehidos
The mechanism consists in the addition of hydride to the carbon of the nitrile, forming an imine that is hydrolyzed to aldehyde.
There are other modified reductants capable of reducing nitriles to aldehydes, such as: Li[CH 3 CH 2 O] 3 AlH