TornadoWebServer : Uncontrolled Resource Consumption Vulnerability - CVE-2026-82397

Tornado is a Python web framework and asynchronous networking library. Prior to 6.5.8 Tornado parses application/x-www-form-urlencoded request bodies with urllib.parse.parse_qs in tornado/escape.py without passing max_num_fields. RequestHandler._execute in tornado/web.py parses the body before handler dispatch through HTTPServerRequest._parse_body and parse_body_arguments in tornado/httputil.py so an unauthenticated request body containing millions of separator-delimited fields can synchronous