The stories claim that Jesus (Yeshu) was an illegitimate child, and that he practiced magic and heresy, seduced women, and died a shameful death.
https://en.wikipedia.org/wiki/Toledot_Yeshu
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This scurrilous fable of the life of Jesus is a medieval work, probably written down in the tenth century. .... Though its contents enjoyed a certain currency in the oral traditions of the Jewish masses, it was almost totally ignored by official or scholarly Judaism. Anti-Semites have not failed to employ it as an illustration of the blasphemous character of the Synagogue."