CVE-2026-49853

Public on 2026-07-14

Modified on 2026-07-16

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.

Severity

Important

See what this means

CVSS v3 Base Score

8.6

See breakdown

Affected Packages

Platform	Package	Status
Amazon Linux 2023	python-flit	Not Affected
Amazon Linux 2 - Core	python-tornado	Pending Fix
Amazon Linux 2023	python-tornado	Pending Fix
Amazon Linux 2 - Core	python3-tornado	Pending Fix
Amazon Linux 2023	python3.13-tornado	Pending Fix

CVSS Scores

	Score Type	Score	Vector
Amazon Linux	CVSSv3	8.6	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

References

FAQs regarding Amazon Linux ALAS/CVE Severity Red Hat: CVE-2026-49853 Mitre: CVE-2026-49853