UBUNTU-CVE-2026-49853

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, authusername, authpassword, and authmode in place when a redirect changed scheme, host, or port...

CVE-2026-49853

Tornado before 6.5.6 exposed an Authorization header across cross-origin redirects in SimpleAsyncHTTPClient: when following 3xx redirects, the client shallow-copies the request and rewrites the URL without clearing Authorization (and related) headers if the origin changes. The issue is fixed in T...

CVE-2026-49853 Tornado: Authorization header forwarded across cross-origin redirects in SimpleAsyncHTTPClient

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, authusername, authpassword, and authmode in place when a redirect changed scheme, host, or port...

Tornado: Authorization header forwarded across cross-origin redirects in SimpleAsyncHTTPClient

Summary When SimpleAsyncHTTPClient follows a 3xx redirect, it shallow-copies the original HTTPRequest, rewrites the URL, decrements maxredirects, and removes only the Host header. It does not clear Authorization, authusername, authpassword, or authmode when the redirect target changes origin. As ...