not much chance of a repair. I expect it is made of chromed steel, which is prone to rust (often from the inside), and possibly starting before it even leaves the factory. Something to do with the electrochemical table of reactivity (I may have got the name wrong). Chinese steel is usually of very poor quality as it is made of inferior alloy for cheapness, even their stainless steel tarnishes and rusts if it has no nickel in the mix.
I don't know, but the point you show might be a badly-made welded joint when it was made, and there is perhaps a crack or thin or porous spot under the chrome, so that even if you bodge it up, it will leak again.
At greater expense, if you can afford a stainless steel one, it will last quite a lot longer. The best I have seen are made of brass, chrome plated, and are often very large diameter pipes in an H or gym-bar configuration, with ball-shaped connectors in the corners. I have known them in fine condition after 50 years or more, long after steel radiators have rusted and leaked.
I take it you have closed the valves at both ends. This will stop the radiator being pressurised, and the leak will fade away. You can use the bleed screw to check there is no pressure.