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Privacy Statement Third-Party Cookies AcceptRejectManage cookies MSRC  Customer Guidance  Security Update Guide  Vulnerabilities  CVE-2026-45641 Windows Hyper-V Remote Code Execution Vulnerability New On this page  CVE-2026-45641  Subscribe RSS PowerShell  API  CSAF Security Vulnerability Released: Jun 9, 2026 Assigning CNA Microsoft CVE.org link CVE-2026-45641  Impact Remote Code Execution Max Severity Critical Weakness CWE-843: Access of Resource Using Incompatible Type ('Type Confusion') CVSS Source Microsoft Vector String CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Metrics CVSS:3.1 8.4 / 7.3  Base score metrics: 8.4 / Temporal score metrics: 7.3  Expand all  Collapse all Metric Value   Base score metrics(8) Attack Vector Local Attack Complexity Low Privileges Required None User Interaction None Scope Unchanged Confidentiality High Integrity High Availability High   Temporal score metrics(3) Exploit Code Maturity Unproven Remediation Level Official Fix Report Confidence Confirmed Please see Common Vulnerability Scoring System for more information on the definition of these metrics. Executive Summary Out-of-bounds read in Windows Hyper-V allows an unauthorized attacker to execute code locally. Exploitability The following table provides an exploitability assessment for this vulnerability at the time of original publication. Publicly disclosed No Exploited No Exploitability assessment Exploitation Less Likely FAQ How could an attacker exploit this vulnerability? This vulnerability would require an authenticated attacker on a guest VM to send specially crafted file operation requests on the VM to hardware resources on the VM which could result in remote code execution on the host server. According to the CVSS metric, the attack vector is local (AV:L). Why does the CVE title indicate that this is a remote code execution? The word Remote in the title refers to the location of the attacker. This type of exploit is sometimes referred to as Arbitrary Code Execution (ACE). The attack itself is carried out locally. This means an attacker or victim needs to execute code from the local machine to exploit the vulnerability. Acknowledgements MORSE with Microsoft 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: Jun 9, 2026 Windows 11 version 26H1 for x64-based Systems - Remote Code Execution Critical Title: Knowledge Base Articles for Windows 11 version 26H1 for x64-based Systems, Content:, 1 link 5095051  Title: Download Security Update for Windows 11 version 26H1 for x64-based Systems, Content:, 1 link Security Update  Title: Build numbers, Content: 10.0.28000.2269 Title: Assigning CNA, Content: Microsoft Title: Release date, Content: Jun 9, 2026 Windows Server 2025 - Remote Code Execution Critical Title: Knowledge Base Articles for Windows Server 2025, Content:, 1 link 5094125  Title: Download Security Update for Windows Server 2025, Content:, 1 link Security Update  Title: Build numbers, Content: 10.0.26100.32995 Title: Assigning CNA, Content: Microsoft Title: Release date, Content: Jun 9, 2026 Windows 11 Version 24H2 for x64-based Systems - Remote Code Execution Critical Title: Knowledge Base Articles for Windows 11 Version 24H2 for x64-based Systems, Content:, 1 link 5094126  Title: Download Security Update for Windows 11 Version 24H2 for x64-based Systems, Content:, 1 link Security Update  Title: Build numbers, Content: 10.0.26100.8655 Title: Assigning CNA, Content: Microsoft Title: Release date, Content: Jun 9, 2026 Windows 11 Version 23H2 for x64-based Systems - Remote Code Execution Critical Title: Knowledge Base Articles for Windows 11 Version 23H2 for x64-based Systems, Content:, 1 link 5093998  Title: Download Security Update for Windows 11 Version 23H2 for x64-based Systems, Content:, 1 link Security Update  Title: Build numbers, Content: 10.0.22631.7219 Title: Assigning CNA, Content: Microsoft Title: Release date, Content: Jun 9, 2026 Windows 11 Version 25H2 for x64-based Systems - Remote Code Execution Critical Title: Knowledge Base Articles for Windows 11 Version 25H2 for x64-based Systems, Content:, 1 link 5094126  Title: Download Security Update for Windows 11 Version 25H2 for x64-based Systems, Content:, 1 link Security Update  Title: Build numbers, Content: 10.0.26200.8655 Title: Assigning CNA, Content: Microsoft Title: Release date, Content: Jun 9, 2026 Windows Server 2025 (Server Core installation) - Remote Code Execution Critical Title: Knowledge Base Articles for Windows Server 2025 (Server Core installation), Content:, 1 link 5094125  Title: Download Security Update for Windows Server 2025 (Server Core installation), Content:, 1 link Security Update  Title: Build numbers, Content: 10.0.26100.32995 Title: Assigning CNA, Content: Microsoft Title: Release date, Content: Jun 9, 2026 Windows 10 Version 22H2 for x64-based Systems - Remote Code Execution Critical Title: Knowledge Base Articles for Windows 10 Version 22H2 for x64-based Systems, Content:, 1 link 5094127  Title: Download Security Update for Windows 10 Version 22H2 for x64-based Systems, Content:, 1 link Security Update  Title: Build numbers, Content: 10.0.19045.7417 Title: Assigning CNA, Content: Microsoft Title: Release date, Content: Jun 9, 2026 Windows 10 Version 21H2 for x64-based Systems - Remote Code Execution Critical Title: Knowledge Base Articles for Windows 10 Version 21H2 for x64-based Systems, Content:, 1 link 5094127  Title: Download Security Update for Windows 10 Version 21H2 for x64-based Systems, Content:, 1 link Security Update  Title: Build numbers, Content: 10.0.19044.7417 Title: Assigning CNA, Content: Microsoft Title: Release date, Content: Jun 9, 2026 Windows Server 2022 (Server Core installation) - Remote Code Execution Critical Title: Knowledge Base Articles for Windows Server 2022 (Server Core installation), Content:, 1 link 5094128  Title: Download Security Update for Windows Server 2022 (Server Core installation), Content:, 1 link Security Update  Title: Build numbers, Content: 10.0.20348.5256 Title: Assigning CNA, Content: Microsoft Title: Release date, Content: Jun 9, 2026 Windows Server 2022 - Remote Code Execution Critical Title: Knowledge Base Articles for Windows Server 2022, Content:, 1 link 5094128  Title: Download Security Update for Windows Server 2022, Content:, 1 link Security Update  Title: Build numbers, Content: 10.0.20348.5256 Title: Assigning CNA, Content: Microsoft All results loaded Loaded all 10 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 Jun 9, 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