CVE-2026-58600

HEVC Video Extensions Elevation of Privilege Vulnerability

HIGH

7.8

CVSS Score

Published: September 8, 2026 at 05:12 PM UTC

Updated: October 14, 2026 at 11:07 PM UTC

14 products affected across 1 vendorHEVC Video ExtensionsHEVC Video Extensions for Licensed ApplicationsHEVC Video Extensions from Device Manufacturer

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Severity

HIGH7.8

Exploit prediction

EPSS 0.5%

SSVC

No known exploit

Description

Heap-based buffer overflow in Microsoft Windows Codecs Library allows an unauthorized attacker to elevate privileges locally.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

HEVC Video Extensions · Microsoft

95%

v < 2.4.87.01.0.0 ≤ v < 2.4.87.01.0.0

Affected range stops below 2.4.87.0, so it looks safe — our inference, not a vendor statement

HEVC Video Extensions for Licensed Applications · Microsoft

95%

v < 2.4.85.02.0.0.0 ≤ v < 2.4.85.02.0.0.0

Affected range stops below 2.4.85.0, so it looks safe — our inference, not a vendor statement

HEVC Video Extensions from Device Manufacturer · Microsoft

95%

v < 2.4.86.0v < 2.5.25.02.0.0.0 ≤ v < 2.4.86.02.0.0.0

Affected range stops below 2.4.86.0, so it looks safe — our inference, not a vendor statement

Affected range stops below 2.5.25.0, so it looks safe — our inference, not a vendor statement

microsoft-windows-10-1809 (environment) · microsoft-windows-10-21h2 (environment) · microsoft-windows-10-22h2 (environment) · microsoft-windows-11-22h2 (environment) · microsoft-windows-11-23h2 (environment) · microsoft-windows-11-24h2 (environment) · microsoft-windows-11-25h2 (environment) · microsoft-windows-11-26h1 (environment) · microsoft-windows-server-2019 (environment) · microsoft-windows-server-2022 (environment) · microsoft-windows-server-2025 (environment)

Windows 10 1809 · Microsoftdevice

80%

All versions

Windows 10 21H2 · Microsoftdevice

80%

All versions

Windows 10 22H2 · Microsoftdevice

80%

All versions

Windows 11 22H2 · Microsoftdevice

80%

All versions