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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-49853
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-14 21:17:02 UTC
Updated2026-07-21 16:17:13 UTC
DescriptionTornado 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.

Risk And Classification

Primary CVSS: v3.1 7.7 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

EPSS: 0.004860000 probability, percentile 0.387700000 (date 2026-07-21)

Problem Types: CWE-200 | CWE-200 CWE-200: Exposure of Sensitive Information to an Unauthorized Actor

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.7HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
3.1CNADECLARED7.7HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Tornadoweb Tornado affected < 6.5.6 Not specified

References

ReferenceSourceLinkTags
github.com/tornadoweb/tornado/releases/tag/v6.5.6 [email protected] github.com
github.com/tornadoweb/tornado/security/advisories/GHSA-3x9g-8vmp-wqvf [email protected] github.com
github.com/tornadoweb/tornado/pull/3626 [email protected] github.com
github.com/tornadoweb/tornado/commit/aba2569f7ed7a6bdbef816658fb6b718253... [email protected] github.com
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