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, 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.

Score

CVSS 3.1 7.7 High

Status

Deferred - security-advisories@github.com

Published

2026-07-14

Last modified

2026-10-24

Weaknesses

CWE-200

Affected products

• Tornado (Tornadoweb)

References

• https://github.com/tornadoweb/tornado/security/advisories/GHSA-3x9g-8vmp-wqvf
• https://github.com/tornadoweb/tornado/pull/3626
• https://github.com/tornadoweb/tornado/commit/aba2569f7ed7a6bdbef816658fb6b7182531b751
• https://github.com/tornadoweb/tornado/releases/tag/v6.5.6