We use optional cookies to improve your experience on our websites, such as through social media connections, and to display personalized advertising based on your online activity. If you reject optional cookies, only cookies necessary to provide you the services will be used. You may change your selection by clicking “Manage Cookies” at the bottom of the page. Privacy Statement Third-Party Cookies AcceptRejectManage cookies MSRC  Customer Guidance  Security Update Guide  Vulnerabilities  CVE-2026-5946 Invalid handling of CLASS != IN New On this page  CVE-2026-5946  Subscribe RSS PowerShell  API  CSAF Security Vulnerability Released: May 23, 2026 Assigning CNA isc CVE.org link CVE-2026-5946  Weakness CWE-20: Improper Input Validation CVSS Source isc Vector String CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Metrics CVSS:3.1 7.5 / 7.5  Base score metrics: 7.5 / Temporal score metrics: 7.5  Expand all  Collapse all Metric Value   Base score metrics(8) Attack Vector Network Attack Complexity Low Privileges Required None User Interaction None Scope Unchanged Confidentiality None Integrity None Availability High Please see Common Vulnerability Scoring System for more information on the definition of these metrics. Acknowledgements Microsoft recognizes the efforts of those in the security community who help us protect customers through coordinated vulnerability disclosure. See Acknowledgements for more information. Security Updates To determine the support lifecycle for your software, see the Microsoft Support Lifecycle. Release date Descending  Edit columns  Download  Filters  Product Family  Max Severity  Impact  Platform   Clear Release date  Product Platform Impact Max Severity Article Download Build Number Assigning CNA Title: Release date, Content: May 23, 2026 azl3 bind 9.20.21-1 Azure Linux 3.0 - Important Title: Knowledge Base Articles for azl3 bind 9.20.21-1, Content:, 1 link CBL-Mariner Releases  Title: Download Security Update for azl3 bind 9.20.21-1, Content:, 1 link Security Update Title: Build numbers, Content: 9.20.23-1 Title: Assigning CNA, Content: isc All results loaded Loaded all 1 rows Disclaimer The information provided in the Microsoft Knowledge Base is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. Revisions version revisionDate description 1.0 May 23, 2026 Information published.  How satisfied are you with the MSRC Security Update Guide? Rating  Broken  Bad  Below average  Average  Great!  Your Privacy Choices Consumer Health Privacy