{"action":"Upgrade tornado to 6.5.5 or later.","affected":[{"fixed":"6.5.5","introduced":"0"}],"component":"tornado","cve_ids":["CVE-2026-35536"],"ecosystem":"PyPI","epss":0.00242,"exploited":false,"fixed_versions":["6.5.5"],"ghsa_id":"GHSA-78cv-mqj4-43f7","id":"tcs_01M5KGYJ6KN815G8N2REF0Q1CP","modified_at":"2026-07-13T16:45:06.531920939Z","published_at":"2026-04-03T04:16:53.550Z","references":["https://osv.dev/vulnerability/PYSEC-2026-2287","https://github.com/tornadoweb/tornado/releases/tag/v6.5.5","https://github.com/tornadoweb/tornado/security/advisories/GHSA-78cv-mqj4-43f7","https://github.com/advisories/GHSA-fqwm-6jpj-5wxc"],"severity":{"label":"medium","score":5.3},"sources":[{"source":"osv","source_id":"PYSEC-2026-2287","url":"https://osv.dev/vulnerability/PYSEC-2026-2287"}],"summary":"In Tornado before 6.5.5, cookie attribute injection could occur because the domain, path, and samesite arguments to .RequestHandler.set_cookie were not checked for crafted characters."}