CVE-2026-69530: CWE-416: Use After Free in Microsoft Windows 10 Version 1809

This vulnerability (CVE-2026-69530) involves a use-after-free condition in the Reliable Multicast Transport Driver (RMCAST) component of Microsoft Windows 10 Version 1809. Exploitation of this flaw could allow an attacker to execute arbitrary code remotely without user interaction, given network access. The vulnerability affects Windows 10 Version 1809 builds from 10.0.17763.0 up to but not including 10.0.17763.9245, builds from 10.0.20348.0 up to but not including 10.0.20348.5622, and builds from 10.0.26100.0 up to but not including 10.0.26100.33438. Microsoft has released an official fix to address this issue.

Successful exploitation of this vulnerability could result in remote code execution with high impact on confidentiality, integrity, and availability. An attacker could gain unauthorized control over the affected system remotely without requiring user interaction. There are no known exploits in the wild at this time.

An official fix is available from Microsoft. Users and administrators should apply the security updates provided by Microsoft for Windows 10 Version 1809 to remediate this vulnerability. Refer to the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69530 for detailed patch information and update instructions.