CVE-2026-49853

HIGH

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

Title source: cna
STIX 2.1

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.

References (4)

Core 4

Scores

CVSS v3 7.7
EPSS 0.0037
EPSS Percentile 29.2%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-200
Status published
Products (1)
tornadoweb/tornado < 6.5.6
Published Jul 14, 2026
Tracked Since Jul 15, 2026