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TI-2026-18172 Aliases CVE-2026-22611GHSA-9cvc-h2w8-phrp

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

Priority LOW 17CWE-20Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Impact type
—
Confidentiality · integrity · availability
Low · None · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0024 15th percentileScored 2026-11-07
Fix Fixed aws-sdk-net (aws): 4.0.3.3AWSSDK.Core (NuGet): 4.0.3.3

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
AWSaws-sdk-net4.0.0 to before 4.0.3.34.0.3.3Patch availableCNA
—AWSSDK.Core (NuGet)4.0.0 to before 4.0.3.34.0.3.3Patch availableGHSA-9cvc-h2w8-phrp
  • aws-sdk-net VendorAWS Affected 4.0.0 to before 4.0.3.3 Fixed in 4.0.3.3 Patch available CNA
  • AWSSDK.Core (NuGet) Vendor— Affected 4.0.0 to before 4.0.3.3 Fixed in 4.0.3.3 Patch available GHSA-9cvc-h2w8-phrp

Remediation

  • Fix · CNA aws-sdk-net (aws) Fixed in 4.0.3.3
  • Fix · GHSA-9cvc-h2w8-phrp AWSSDK.Core (NuGet) Fixed in 4.0.3.3 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-22611
  2. 2026-10-03 Alias added: GHSA-9cvc-h2w8-phrp

References

Advisory 1

Other 2

  • TI-2026-23989 crypto: algif_aead - Revert to operating out-of-place KEVCVSS 3.1HIGH 7.8
  • TI-2023-23979 The HTTP/2 protocol allows a denial of service (server resource consumption) because… KEVCVSS 3.1HIGH 7.5
  • TI-2024-18648 Amazon AWS Amplify CLI before 12.10.1 incorrectly configures the role trust policy of IAM… CVSS 3.1CRITICAL 9.8
  • TI-2024-05929 Openssh: regresshion - race condition in ssh allows rce/dos CVSS 3.1HIGH 8.1
  • TI-2025-03847 Input validation issue in AWS Amplify Studio UI component properties CVSS 4.0CRITICAL 9.0
  • TI-2026-11603 HTTP/2 Stream Parser Confusion Body-Inspection Bypass in Amazon CloudFront with AWS WAF CVSS 4.0HIGH 7.9
See all 383 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences