The hose relies on a rubber gasket to seal. The compression fitting below from the solid pipe to that coupling relies on a compression ring and the nut...no pipe dope, no tape, and no gasket. If it's leaking from the bottom connection, tighten the nut while holding the fitting as I said above. If it's leaking from the top, that gets tougher when it's integral with the faucet. I've not looked for one, but you MIGHT be able to dig out the rubber gasket and replace it. Or, just hold the middle and tighten the top nut a little as well. If you can't find a suitably sized gasket, the faucet manufacturer might just send you a new whole faucet...
If the solid tubing got bent where the compression fitting is, it might leak, and then, you'd have to remove it and replace.
That could be with a new piece of solid riser, or another hose to that same coupler you have.