EUVD-2026-73642
GHSA-722r-36gm-q2j8
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
File-parsing trigger requires local user interaction (AV:L/UI:R); no privileges needed; full code execution impact (C:H/I:H/A:H) within user process scope.
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 execute code locally.
AnalysisAI
Heap-based buffer overflow in Microsoft HEVC Video Extensions (Windows Codecs Library) enables local code execution with the full privileges of the targeted user when a victim opens or previews a specially crafted HEVC/H.265 video file. Three distinct distribution variants of the codec are affected - the standalone Store app, the device-manufacturer-bundled version, and the licensed-applications edition - all requiring upgrade to their respective patched releases. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that one of the three HEVC Video Extensions codec variants be installed on the target system (standalone Store app, device-manufacturer bundle, or licensed-applications edition) at a version below the respective fix thresholds. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score of 7.8 (AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H) accurately captures the attack surface: local exploitation requiring user interaction but no prior privileges. … 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 to the patched versions via the Microsoft Store: HEVC Video Extensions standalone 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 and inventory all Windows systems with HEVC Video Extensions installed, and alert users to avoid opening video files from untrusted sources. …
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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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