{"id":"CVE-2026-49853","summary":"Tornado: Authorization header forwarded across cross-origin redirects in SimpleAsyncHTTPClient","details":"Tornado is a Python web framework and asynchronous networking library. Prior to 6.5.6, SimpleAsyncHTTPClient shallow-copied redirected requests and removed only the Host header, leaving Authorization, auth_username, auth_password, and auth_mode in place when a redirect changed scheme, host, or port. This issue is fixed in version 6.5.6.","aliases":["GHSA-3x9g-8vmp-wqvf","PYSEC-2026-3387"],"modified":"2026-07-17T03:41:37.789037929Z","published":"2026-07-14T20:41:32.075Z","related":["CGA-9p8v-q7j8-x8x2","SUSE-SU-2026:22286-1","SUSE-SU-2026:22373-1","SUSE-SU-2026:22430-1","SUSE-SU-2026:22445-1","SUSE-SU-2026:2725-1","SUSE-SU-2026:2726-1","openSUSE-SU-2026:11027-1","openSUSE-SU-2026:21067-1"],"database_specific":{"cwe_ids":["CWE-200"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49853.json","cna_assigner":"GitHub_M"},"references":[{"type":"WEB","url":"https://github.com/tornadoweb/tornado/releases/tag/v6.5.6"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49853.json"},{"type":"ADVISORY","url":"https://github.com/tornadoweb/tornado/security/advisories/GHSA-3x9g-8vmp-wqvf"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-49853"},{"type":"FIX","url":"https://github.com/tornadoweb/tornado/commit/aba2569f7ed7a6bdbef816658fb6b7182531b751"},{"type":"FIX","url":"https://github.com/tornadoweb/tornado/pull/3626"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/tornadoweb/tornado","events":[{"introduced":"0"},{"fixed":"aba2569f7ed7a6bdbef816658fb6b7182531b751"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"6.5.6"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"versions":["v6.5.5","v6.5.4","v6.5.3","v6.5.2","v6.5.1","v6.5.0","v6.5.0b1","v6.4.1","v6.4.0","v6.4.0b1","v6.3.1","v6.3.0","v6.3.0b1","v6.2.0","v6.2.0b2","v6.2.0b1","v6.1.0","v6.1.0b2","v6.1.0b1","v6.0.0","v6.0.0b1","v5.1.0","v5.0.0","v4.5.0","v4.5.1","v4.4.1","v4.4.0","v4.4.0b1","v4.3.0","v4.3.0b2","v4.3.0b1","v4.2.0","v4.2.0b1","v4.1.0","v4.1.0b2","v4.1.0b1","v4.0.0","v4.0.0b3","v4.0.0b2","v4.0.0b1","v3.2.0","v3.2.0b2","v3.2.0b1","v3.1.0","v3.0.1","v3.0.0","v2.1.1","v2.3.0","v2.2.0","v2.1.0","v2.0.0","v1.2.0","v1.1.0","v1.0.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-49853.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N"}]}