Security readout for executives and security teams
Plain-English summary
CVE-2026-22611 affects AWS SDK for .NET V4 versions 4.0.0 through before 4.0.3.3. If someone can control the SDK environment’s region input, AWS API calls may be routed to invalid or non-AWS hosts. AWS describes the update as a defense-in-depth enhancement. The listed severity is low.
Executive priority
Treat as routine but real dependency hygiene. Prioritize updates for .NET services that handle sensitive AWS interactions or allow broad configuration changes. The public data indicates low severity and no confirmed exploitation, but the affected version range should be removed during normal patch cycles.
Technical view
The issue is improper input validation of specific region parameter values in aws-sdk-net. An actor with access to the SDK’s runtime environment could set an invalid region value, causing customer applications to route AWS API calls to non-existent or non-AWS hosts. Patched version is 4.0.3.3. CVSS 3.1 score is 3.7, vector AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N.
Likely exposure
Exposure is limited to applications using AWS SDK for .NET V4 versions >=4.0.0 and <4.0.3.3 where the region input can be influenced through environment or configuration. Applications on earlier major versions or 4.0.3.3 and later are not identified as affected in the provided sources.
Exploitation context
The sources do not report active exploitation, and the CVE is not listed as KEV. Practical abuse appears to require the ability to affect the environment or configuration used by the SDK’s region input. The CVSS rating indicates high attack complexity and low confidentiality impact only.
Researcher notes
This is classified as CWE-20 with a low CVSS score. The key research question is whether any application exposes region configuration to less-trusted users or automation. Sources characterize the fix as defense-in-depth and do not provide public exploitation details. Avoid assuming broader AWS service compromise from this CVE alone.
Mitigation direction
- Upgrade aws-sdk-net to version 4.0.3.3 or later.
- Review vendor advisory for any updated AWS guidance.
- Restrict who can modify application environment variables and configuration.
- Validate deployment pipelines do not inject untrusted region values.
Validation and detection
- Inventory .NET applications using AWS SDK for .NET V4.
- Confirm package versions are not >=4.0.0 and <4.0.3.3.
- Review configuration sources for SDK region values.
- Check change control around environment and deployment configuration access.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-20: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2026-22611 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Low
- CVSS
- 3.7 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N2.21.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
3.7LowVector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/aws/aws-sdk-net/security/advisories/GHSA-9cvc-h2w8-phrpCVE reference · x_refsource_CONFIRM
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Input Validation
Improper Input Validation represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.