Provided herein is a composition for the treatment of keratin fibers comprising, a cosmetically acceptable medium; at least one fatty alcohol; at least one oxyalkylenated fatty alcohol; at least one oxidizing agent; and at least one oil other than a fatty alcohol present in an amount greater than or equal to 10% by weight relative to the total weight of the composition, wherein the weight ratio of the at least one fatty alcohol to the at least one oxyalkylenated fatty alcohol has a value less than or equal to 5; and further wherein the pH of the composition ranges from 1.5 to 4.5. Also provided herein is a composition for the treatment of keratin fibers comprising, a cosmetically acceptable medium; at least one fatty alcohol present in an amount ranging from 3 to 25% by weight relative to the total weight of the composition; at least one oxyalkylenated fatty alcohol; at least one oxidizing agent; and at least one oil other than a fatty alcohol present in an amount greater than or equal to 10% by weight relative to the total weight of the composition, wherein the weight ratio of the at least one fatty alcohol to the at least one oxyalkylenated fatty alcohol has a value less than or equal to 5; and further wherein the pH of the composition is alkaline. Also provided herein is a method for treating keratin fibers, comprising applying to the keratin fibers at least one oxidizing composition described herein.