{"action":"Upgrade tornado to 6.5.3 or later.","affected":[{"fixed":"6.5.3","introduced":"0"}],"component":"tornado","cve_ids":["CVE-2025-67725"],"ecosystem":"PyPI","epss":0.00559,"exploited":false,"fixed_versions":["6.5.3"],"ghsa_id":"GHSA-c98p-7wgm-6p64","id":"tcs_01M5KFCKNM5H8F3K4Z37FG0GSV","modified_at":"2026-07-20T19:15:27.567094965Z","published_at":"2026-07-20T18:57:34Z","references":["https://osv.dev/vulnerability/GHSA-c98p-7wgm-6p64","https://github.com/tornadoweb/tornado/security/advisories/GHSA-c98p-7wgm-6p64","https://nvd.nist.gov/vuln/detail/CVE-2025-67725","https://github.com/tornadoweb/tornado/commit/771472cfdaeebc0d89a9cc46e249f8891a6b29cd","https://github.com/pypa/advisory-database/tree/main/vulns/tornado/PYSEC-2025-266.yaml","https://github.com/tornadoweb/tornado","https://github.com/tornadoweb/tornado/releases/tag/v6.5.3"],"severity":{"label":"high","score":7.5},"sources":[{"source":"osv","source_id":"GHSA-c98p-7wgm-6p64","url":"https://osv.dev/vulnerability/GHSA-c98p-7wgm-6p64"}],"summary":"Tornado: Quadratic DoS via Repeated Header Coalescing"}