PT-2026-60002

Summary Tornado's optional native extension tornado.speedups implements websocket mask without validating that the mask argument is exactly four bytes long. The C function reads four bytes from mask unconditionally, even when Python passes a shorter byte string. This can read beyond the provided...

Buffer Over-read

Overview tornado is a Python web framework and asynchronous networking library, originally developed at FriendFeed. Affected versions of this package are vulnerable to Buffer Over-read via the websocketmask function in the speedups component. An attacker can trigger a read past the end of the mas...