{"action":"Upgrade tornado to 6.5.6 or later.","affected":[{"fixed":"6.5.6","introduced":"0"}],"component":"tornado","cve_ids":["CVE-2026-49853"],"ecosystem":"PyPI","epss":0.00445,"exploited":false,"fixed_versions":["6.5.6"],"ghsa_id":"GHSA-3x9g-8vmp-wqvf","id":"tcs_01M5KH51K7T1CXAE101YQQEE3X","modified_at":"2026-07-13T16:32:47.094943597Z","published_at":"2026-07-13T15:46:17.169568Z","references":["https://osv.dev/vulnerability/PYSEC-2026-3387","https://github.com/tornadoweb/tornado/security/advisories/GHSA-3x9g-8vmp-wqvf","https://github.com/tornadoweb/tornado","https://pypi.org/project/tornado","https://github.com/advisories/GHSA-3x9g-8vmp-wqvf","https://nvd.nist.gov/vuln/detail/CVE-2026-49853"],"severity":{"label":"high","score":7.7},"sources":[{"source":"osv","source_id":"PYSEC-2026-3387","url":"https://osv.dev/vulnerability/PYSEC-2026-3387"}],"summary":"Tornado: Authorization header forwarded across cross-origin redirects in SimpleAsyncHTTPClient"}