CVE-2026-22611

AWS SDK for .NET V4 adopted defense in depth enhancement for region parameter value

State: Published
Severity: 3.7 Low
Published: Jan 10, 2026
Updated: Jan 12, 2026
Reserved: Jan 7, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	3.7 Low	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N	GitHub_M

Weaknesses

CWE-20 Improper Input Validation

Affected Products

Product	Versions
aws-sdk-netaws	>= 4.0.0, < 4.0.3.3Affected

References

https://github.com/aws/aws-sdk-net/security/advisories/GHSA-9cvc-h2w8-phrp

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