AWS SDK for .NET works with Amazon Web Services to help build scalable solutions with Amazon S3, Amazon DynamoDB, Amazon Glacier, and more. From versions 4.0.0 to before 4.0.3.3, Customer applications could be configured to improperly route AWS API calls to non-existent or non-AWS hosts. This notification is related to the use of specific values for the region input field when calling AWS services. An actor with access to the environment in which the SDK is used could set the region input field to an invalid value. This issue has been patched in version 4.0.3.3.
History

Mon, 12 Jan 2026 15:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Mon, 12 Jan 2026 14:45:00 +0000

Type Values Removed Values Added
First Time appeared Amazon
Amazon aws Sdk Net
Vendors & Products Amazon
Amazon aws Sdk Net

Sat, 10 Jan 2026 05:45:00 +0000

Type Values Removed Values Added
Description AWS SDK for .NET works with Amazon Web Services to help build scalable solutions with Amazon S3, Amazon DynamoDB, Amazon Glacier, and more. From versions 4.0.0 to before 4.0.3.3, Customer applications could be configured to improperly route AWS API calls to non-existent or non-AWS hosts. This notification is related to the use of specific values for the region input field when calling AWS services. An actor with access to the environment in which the SDK is used could set the region input field to an invalid value. This issue has been patched in version 4.0.3.3.
Title AWS SDK for .NET V4 adopted defense in depth enhancement for region parameter value
Weaknesses CWE-20
References
Metrics cvssV3_1

{'score': 3.7, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2026-01-10T05:37:08.297Z

Updated: 2026-01-12T14:39:57.770Z

Reserved: 2026-01-07T21:50:39.534Z

Link: CVE-2026-22611

cve-icon Vulnrichment

Updated: 2026-01-12T14:39:55.096Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-01-10T06:15:51.270

Modified: 2026-01-13T14:03:18.990

Link: CVE-2026-22611

cve-icon Redhat

No data.