EUVD-2026-73077
GHSA-j9hq-499p-g5xg
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Local file-based LPE requiring user interaction but no prior privileges; full local system compromise on successful exploitation.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Heap-based buffer overflow in Microsoft Windows Codecs Library allows an unauthorized attacker to elevate privileges locally.
AnalysisAI
Heap-based buffer overflow in the Microsoft Windows Codecs Library (HEVC Video Extensions) enables local privilege escalation on Windows systems. Three distinct Store app variants - the base edition, the licensed-application edition, and the device-manufacturer-bundled edition - are all affected across specific version ranges. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the target Windows system has any of the three affected HEVC Video Extensions packages installed and that a local user opens or previews a specially crafted HEVC media file (UI:R). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.8 High rating is driven primarily by the full C:H/I:H/A:H impact triad and the low attack complexity once local access is established. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Update all installed HEVC Video Extensions variants to or beyond the fixed versions via the Microsoft Store or Windows Update: base HEVC Video Extensions to 2.4.87.0 or later, HEVC Video Extensions for Licensed Applications to 2.4.85.0 or later, and HEVC Video Extensions from Device Manufacturer to 2.4.86.0 or later. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all Windows endpoints running the affected HEVC Video Extensions Store app variants (base edition, licensed-application edition, and device-manufacturer-bundled edition) and restrict video file sharing from untrusted sources where feasible. …
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Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Buffer Overflow
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External POC / Exploit Code
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