EUVD-2026-73848
GHSA-hjjj-2c64-x435
Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Network delivery of malicious media is straightforward (AV:N/AC:L/PR:N), but single active user interaction is required (UI:R); full code execution justifies C:H/I:H/A:H.
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 over a network.
AnalysisAI
Heap-based buffer overflow in Microsoft's Web Media Extensions component of the Windows Codecs Library allows an unauthenticated remote attacker to achieve arbitrary code execution by delivering a specially crafted media file. The EUVD identifies all versions from 1.0.0.0 through pre-1.2.42.0 as affected. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the target system has Web Media Extensions version below 1.2.42.0 installed from the Microsoft Store. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 8.8 rating (AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H) appropriately captures a high-severity, low-complexity path to full code execution requiring only a single user interaction - opening or previewing a malicious media file. … 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 | The primary fix is to update Web Media Extensions to version 1.2.42.0 or later via the Microsoft Store or Windows Update; Microsoft has released a patch per the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-81352. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Inventory Windows systems and identify those running vulnerable Windows Codecs Library versions, then assess user exposure to media files from external 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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