CVE-2026-22611CWE-20

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

Low · published January 10, 2026

CVSS v3.1
3.7
EPSS
0%
Percentile
14.3
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
3.7 · LOW
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00240 · 14.3th percentile
Weakness
CWE-20 · Improper Input Validation
Published
2026-01-10T05:37Z
EPSS history
Timeline
  • 10 JAN 05:37Z
    AWS SDK for .NET V4 adopted defense in depth enhancement for region parameter value
    cvelistv5