The actress will apparently be on hand to promote her film On The Road, which will have a special screening during the festival.
"Kristen will be there," a source told E! Online.
Should she make an appearance, this would be Stewart's first red carpet event since admitting to cheating on boyfriend Robert Pattinson with her Snow White and the Huntsman director Rupert Sanders.
Pattinson made his first media appearance since news of the affair broke on Monday (August 13), when he visited The Daily Show to promote his film Cosmopolis.
Stewart's Panic Room co-star Jodie Foster recently penned a column defending the 22-year-old and criticising the media attention surrounding her.
Watch Kristen Stewart in the trailer for On the Road below:
Photo gallery - Kristen Stewart and Robert Pattinson: