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

Affected: tornadoweb tornado

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.

GHSA-3x9g-8vmp-wqvf — Tornado: Authorization header forwarded across cross-origin redirects in SimpleAsyncHTTPClient

Affected: PyPI: tornado

## Summary

When SimpleAsyncHTTPClient follows a 3xx redirect, it shallow-copies the original HTTPRequest, rewrites the URL, decrements max_redirects, and removes only the Host header. It does not clear Authorization, auth_username, auth_password, or auth_mode when the redirect target changes origin.

As a result, credentials intended for one origin can be forwarded to a different origin when follow_redirects=True, which is the default.

Beginning in Tornado 6.5.6, `SimpleAsyncHTTPClient` matches the default behavior of `libcurl` (and therefore `CurlAsyncHTTPClient`): When a redirect changes the scheme, host, or port of the url, the `Authorization` and `Cookie` headers will be removed when following the redirect.

PYSEC-2026-3387 — Tornado: Authorization header forwarded across cross-origin redirects in SimpleAsyncHTTPClient

Affected: PyPI: tornado

## Summary

As a result, credentials intended for one origin can be forwarded to a different origin when follow_redirects=True, which is the default.