{"action":"Upgrade tornado to 6.5.5 or later.","affected":[{"fixed":"6.5.5","introduced":"0"}],"component":"tornado","cve_ids":["CVE-2026-31958"],"ecosystem":"PyPI","epss":0.00417,"exploited":false,"fixed_versions":["6.5.5"],"ghsa_id":"GHSA-qjxf-f2mg-c6mc","id":"tcs_01M5KGSC7SP8CRDC6RXQ6PNTVB","modified_at":"2026-05-20T09:19:20.297525Z","published_at":"2026-03-11T20:16:16.617Z","references":["https://osv.dev/vulnerability/PYSEC-2026-140","https://lists.debian.org/debian-lts-announce/2026/04/msg00000.html","https://github.com/tornadoweb/tornado/security/advisories/GHSA-qjxf-f2mg-c6mc"],"severity":{"label":"high","score":7.5},"sources":[{"source":"osv","source_id":"PYSEC-2026-140","url":"https://osv.dev/vulnerability/PYSEC-2026-140"}],"summary":"Tornado is a Python web framework and asynchronous networking library. In versions of Tornado prior to 6.5.5, the only limit on the number of parts in multipart/form-data is the max_body_size setting"}