I don't know this particular camera, but from the symptoms it looks very much like the back is not closing all the way. I'm assuming the back is hinged at left, by the cartridge. The leak is all along the right edge, which is where the largest gap would be if something isn't holding the back snug against the body.
It would have been helpful to see the whole width of the film, including the sprockets. The sprockets are useful for diagnosing things like this because they should not be exposed at all when everything is working.
With film in the camera, close the back and look carefully at the right edge. See if you can push on it a bit so that it closes more. You shouldn't be able to do that, but I suspect you will be able to. There is probably some sort of spring-loaded latch that isn't working anymore, but something else is still holding the back mostly shut. Or, maybe you just didn't shut it quite right for this roll.