Vulnerabilities CVE-2026-49853

CVE-2026-49853

High

Open

TLP:CLEAR

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

NVD CVE.org

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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.

Details

CVSS Score: 7.7
EPSS Score ⓘ: 0.37%

29.6th percentile
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Confidence: 90%
Published: Jul 14, 2026
Last Modified: Jul 14, 2026

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