{"id":"CVE-2026-91990","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-91990","summary":"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…","details":"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.","published":"2026-09-15T16:17:58.147","modified":"2026-09-15T16:17:58.147","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":null,"references":[{"type":"WEB","url":"https://github.com/tornadoweb/tornado/security/advisories/GHSA-8423-8fgw-73vq"},{"type":"WEB","url":"https://www.vulncheck.com/advisories/tornado-before-6.5.8-memory-amplification-dos-via-multipart"}],"provenance":{"sources":["OSV.dev","NVD","FIRST.org (EPSS)"],"lastVerified":"2026-09-15T16:17:58.147"}}