cve 2026 58634

The cve 2026 58634 tag focuses on a high-severity elevation-of-privilege vulnerability in the Desktop Window Manager (DWM) affecting Windows 11 version 26H1. The issue is described as a use-after-free flaw and requires a local, authenticated attacker, rather than direct internet exposure. Coverage includes Microsoft’s July 14 advisory, the Important severity rating, and the National Vulnerability Database CVSS 3.1 score of 7.8. It also covers KB5101649, the cumulative update that moves affected systems from builds 28000.0 through 28000.2524 to build 28000.2525. The update applies to both x64 and ARM64 Windows 11 26H1 devices.