Summary
Impact: Elevation of Privilege. Microsoft rating: Important. Not known to be exploited — Exploitation Less Likely. Customer action: Required.
Details
How can I check if the update is installed?
You can check the package version in PowerShell:
Get-AppxPackage -Name Microsoft.HEVCVideoExtension*
What privileges could be gained by an attacker who successfully exploited this vulnerability?
An attacker who successfully exploited this vulnerability could gain SYSTEM privileges.
Security updates
2.4.87.0 — https://apps.microsoft.com/detail/9nmzlz57r3t7
2.4.85.0 — https://apps.microsoft.com/detail/9p3wl96xzmxx
2.4.86.0 — https://apps.microsoft.com/store/detail/hevc-video-extensions-from-device-manufacturer/9N4WGH0Z6VHQ?hl=en-us&gl=us
Vulnerabilities 1
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High 7.8
HEVC Video Extensions Elevation of Privilege Vulnerability
Heap-based buffer overflow in Microsoft Windows Codecs Library allows an unauthorized attacker to elevate privileges locally.
Revision history
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#1
Information published.
References
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CVE-2026-58600 HEVC Video Extensions Elevation of Privilege Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58600
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Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
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Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
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Common Vulnerability Scoring System
https://www.first.org/cvss