{"action":"Upgrade tornado to 6.5.8 or later.","affected":[{"fixed":"6.5.8","introduced":"6.5.5"}],"component":"tornado","cve_ids":["CVE-2026-91991"],"ecosystem":"PyPI","epss":0.00247,"exploited":false,"fixed_versions":["6.5.8"],"ghsa_id":"GHSA-wwv5-g3v4-889x","id":"tcs_01M5KG30PK3VWCVM90KVXYQVSJ","modified_at":"2026-09-16T03:56:00.367681644Z","published_at":"2026-09-01T20:17:23Z","references":["https://osv.dev/vulnerability/GHSA-wwv5-g3v4-889x","https://github.com/tornadoweb/tornado/security/advisories/GHSA-wwv5-g3v4-889x","https://github.com/tornadoweb/tornado/pull/3704","https://github.com/tornadoweb/tornado/pull/3706","https://github.com/tornadoweb/tornado/commit/6ef836e43e1278530041376adb32504daa977b91","https://github.com/tornadoweb/tornado/commit/da284767eae8e1f0484f123b8c3225f6465b09c7","https://github.com/tornadoweb/tornado","https://github.com/tornadoweb/tornado/releases/tag/v6.5.8"],"severity":{"label":"low"},"sources":[{"source":"osv","source_id":"GHSA-wwv5-g3v4-889x","url":"https://osv.dev/vulnerability/GHSA-wwv5-g3v4-889x"}],"summary":"Tornado: Incomplete fix for CVE-2026-35536: cookie attribute injection re-opened via the legacy case-insensitive `**kwargs` path in `set_cookie`"}