CVE-2026-49853

HIGH7.7

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

Published Jul 14, 2026

Modified Yesterday

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.

References

WEB

https://github.com/tornadoweb/tornado/commit/aba2569f7ed7a6bdbef816658fb6b7182531b751

WEB

https://github.com/tornadoweb/tornado/pull/3626

WEB

https://github.com/tornadoweb/tornado/releases/tag/v6.5.6

WEB

https://github.com/tornadoweb/tornado/security/advisories/GHSA-3x9g-8vmp-wqvf

ADVISORY

https://www.cve.org/CVERecord?id=CVE-2026-49853

CVSS Analysis