{"action":"Upgrade tornado to 6.5.3 or later.","affected":[{"fixed":"6.5.3","introduced":"0"}],"component":"tornado","cve_ids":["CVE-2025-67726"],"ecosystem":"PyPI","epss":0.00535,"exploited":false,"fixed_versions":["6.5.3"],"ghsa_id":"GHSA-jhmp-mqwm-3gq8","id":"tcs_01M5KGPHPEM2ABWA3CRWQMFYHX","modified_at":"2026-07-13T07:15:45.375541292Z","published_at":"2025-12-12T07:15:44.920Z","references":["https://osv.dev/vulnerability/PYSEC-2025-267","https://github.com/tornadoweb/tornado/releases/tag/v6.5.3","https://github.com/tornadoweb/tornado/security/advisories/GHSA-jhmp-mqwm-3gq8","https://github.com/tornadoweb/tornado/commit/771472cfdaeebc0d89a9cc46e249f8891a6b29cd"],"severity":{"label":"high","score":7.5},"sources":[{"source":"osv","source_id":"PYSEC-2025-267","url":"https://osv.dev/vulnerability/PYSEC-2025-267"}],"summary":"Tornado is a Python web framework and asynchronous networking library. Versions 6.5.2 and below use an inefficient algorithm when parsing parameters for HTTP header values, potentially causing a DoS."}