EUVD-2026-44247
GHSA-7mv3-4x8j-4pgx
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
File-parsing overflow needs no auth (PR:N) but requires the victim to open crafted media (AV:L/UI:R); memory-corruption code execution yields full C/I/A impact in the user's context (S:U).
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Heap-based buffer overflow in Microsoft Windows Media Foundation allows an unauthorized attacker to execute code locally.
AnalysisAI
Local code execution in Microsoft Windows Media Foundation (CWE-122 heap-based buffer overflow) lets an unauthorized attacker run arbitrary code when a victim opens a maliciously crafted media file or content that the platform parses. It affects a broad range of Windows client and server builds from Windows 10 1607 and Windows Server 2012 through Windows 11 26H1 and Windows Server 2025. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the victim to open or process attacker-supplied media content that Windows Media Foundation parses (UI:R - user interaction is mandatory), and no authentication or prior privileges are needed (PR:N). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H, base 7.8 High) describes an unauthenticated but user-interaction-dependent local vector with full confidentiality, integrity, and availability impact - consistent with a file-open exploitation model rather than remote network reach. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker crafts a malicious media file and delivers it via email, a website, or a shared drive; when the victim opens or previews it and Windows Media Foundation parses the content, the heap overflow triggers and executes attacker code in the user's context. Because CVSS is AV:L with UI:R, success depends on convincing the user to open the file, but no credentials are required (PR:N). … |
| Remediation | Patch available per vendor advisory - apply the Microsoft security update for your specific Windows build as listed in the MSRC guide at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56189 (exact fixed build/KB is per-platform in that advisory and not reproduced in the input, so consult MSRC for the version matching your OS). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all Windows systems running affected versions (Windows 10 1607 and later, Windows 11, Windows Server 2012-2025) with priority focus on devices that process media files from external or untrusted sources. …
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Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Heap Overflow
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External POC / Exploit Code
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