Improper API Routing Vulnerability in AWS SDK for .NET
CVE-2026-22611

3.7LOW

Key Information:

Vendor

Aws

Status
Aws-sdk-net
Vendor
CVE Published:
10 January 2026

What is CVE-2026-22611?

The AWS SDK for .NET allows developers to integrate with various Amazon Web Services, but certain versions (4.0.0 to before 4.0.3.3) may lead to improper routing of API calls due to incorrect configuration of the region input field. If an attacker has access to the SDK environment, they can set the region input to an invalid value, which could cause API calls to be directed to non-existent or unintended hosts. This poses a risk to the application’s security and functionality. A patch has been released in version 4.0.3.3 to address this vulnerability.

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Affected Version(s)

aws-sdk-net >= 4.0.0, < 4.0.3.3

References

https://github.com/aws/aws-sdk-net/security/advisories/GH...
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CVSS V3.1

Score:
3.7
Severity:
LOW
Confidentiality:
Low
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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