CVE-2026-49853CWE-200

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

High · published July 14, 2026

CVSS v3.1
7.7
EPSS
0%
Percentile
37.7
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.7 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00445 · 37.7th percentile
Weakness
CWE-200 · Exposure of Sensitive Information to an Unauthorized Actor
Published
2026-07-14T20:41Z
EPSS history
Timeline
  • 14 JUL 20:41Z
    Tornado: Authorization header forwarded across cross-origin redirects in SimpleAsyncHTTPClient
    cvelistv5