The show, whose first episode of the eighth season premiered last week, airs on HBO at 9 pm Eastern Time.
Some social media users responded to the leak.
"You can legally watch leaked episode on Amazon in Germany #GameofThrones," a user wrote on Twitter.
'Game of Thrones' season 8 premiere draws 17.4 mn viewers in US!
The post also featured a screenshot from Amazon Prime in Germany that showed the opening titles of the show, captioned: "Game of Thrones, Staffel 8 [dt./OV] Folge 2" or season eight, episode two.
The publication also confirmed that the second episode was in fact released early, adding that it could be viewed after clicking on an attached link.
Representatives for HBO and Amazon Prime Video did not immediately respond to the request for comment.
This is a second leak of the show after the highly-anticipated opening episode of the final season landed on DirecTV Now, four hours ahead of its premiere time last week.