Yes, Sriracha Sauce made by the Huy Fong company is Vegan. And super freaking good …
INGREDIENTS: Chili, sugar, garlic, salt, distilled vinegar, potassium sorbate and sodium bisulfite as preservatives, and xanthan gum
Edit: It has been brought to my attention that Sriracha is now more than just a brand sauce. Other brands make sriracha and have been known to add shrimp paste. Please note, Huy Fong, the dominant provider of Sriracha Sauce, does NOT have shrimp paste or fish sauce.