TornadoWebServer Allocation of Resources Without Limits or Throttling Vulnerability (CVE-2026-91990)
Description
Tornado before 6.5.8 contains a memory amplification vulnerability in parse_multipart_form_data that splits multipart data before validating the max_parts limit. Attackers can send crafted multipart requests with many parts to create large transient lists, exhausting server memory and causing denial of service.