EUVD-2026-43879
GHSA-hjhc-g9rv-g7cr
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Local content-parsing bug needing no attacker privileges but requiring the victim to open the file, so AV:L/PR:N/UI:R with full C/I/A impact at user context.
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 Windows Data dll allows an unauthorized attacker to execute code locally.
AnalysisAI
Local code execution in Microsoft Windows arises from a heap-based buffer overflow in a Windows Data DLL, letting an attacker who can get a victim to open crafted content run arbitrary code with the victim's privileges. Affected builds span Windows 10 (1607 through 22H2), Windows 11 (24H2, 25H2, 26H1), and Windows Server 2012 through 2025. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires local processing of attacker-supplied content by the affected Windows Data DLL and mandatory user interaction (UI:R) - the victim must open or otherwise cause the malicious file/data to be parsed; it is not remotely triggerable over the network without that action. … 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) describes a local, low-complexity, unauthenticated attack that requires user interaction and yields full confidentiality, integrity, and availability impact - the classic profile of a malicious-file or malicious-content 'open-and-own' bug rather than a remotely wormable flaw. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker crafts a malicious file or data blob that, when processed by the vulnerable Windows Data DLL, overflows a heap buffer; they deliver it via email attachment, download, or a shared document and rely on the victim to open it. When the user opens the content locally, the overflow corrupts the heap and executes attacker-controlled code in the context of the logged-on user. … |
| Remediation | Patch available per vendor advisory: apply the Microsoft security update for CVE-2026-50347 via Windows Update or WSUS/MSRC for every affected client and server SKU, consulting the MSRC Update Guide at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50347 for the exact KB and build numbers per platform (no single fixed version string was provided in the input, so obtain the precise KB from MSRC). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, audit your environment to identify affected systems running Windows 10 (versions 1607-22H2), Windows 11 (versions 24H2, 25H2, 26H1), or Windows Server (2012-2025). …
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External POC / Exploit Code
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