Executive brief
A security vulnerability exists in Windows Media, a component of the Windows operating system used for playing and managing multimedia content. An attacker who already has basic access to a computer could exploit this flaw to gain full administrative control over the system. This could allow them to install malicious software, view or delete sensitive data, or disrupt business operations.
Technical details
A heap-based buffer overflow (CWE-122) exists within the Windows Media component of Microsoft Windows. The vulnerability is triggered when the system improperly handles memory allocation during media processing. An attacker with low-privileged local access can exploit this flaw without any user interaction to execute code with elevated privileges, potentially gaining SYSTEM-level access. The vulnerability affects multiple versions of Windows 11, including 24H2, 25H2, and 26H1. Microsoft has released security updates to address this issue.
Affected products
- Microsoft Windows 11 Version 24H2 10.0.26100.0 to 10.0.26100.8875
- Microsoft Windows 11 Version 25H2 10.0.26200.0 to 10.0.26200.8875
- Microsoft Windows 11 version 26H1 10.0.26200.0 to 10.0.28000.2269
Timeline
- 2026-07-14: disclosed
- 2026-07-14: advisory