This is Spindle, Euonymus europaeus, growing in secondary woodland above the Danube in Budapest. (Very nice thank you. I can recommend it.)
It has very hard wood which made it great for making spindles. Turner was the first to call it a Spindle tree but borrowed from the Dutch. The flowers and fruit are much more spectacular than these photos suggest. I clearly remember the first time I came across it on the edge of a ride in some ancient woodland near where we were living in Sussex back in 2007; it was so garish I concluded that it couldn't possibly be native. I was shocked when I discovered I was wrong.
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