Security Advisory
CVE-2026-49853
7.7
HIGH
Vulnerability Description
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.
Published Date
July 14, 2026
Official Source
NIST NVD Advisory