EUVD-2026-44147
GHSA-5rp5-wgw3-6gwg
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Local attack vector and PR:L because the description explicitly requires an authorized local attacker; C:H for potentially sensitive uninitialized memory contents; no integrity or availability impact applies.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Lifecycle Timeline
2DescriptionCVE.org
Use of uninitialized resource in Windows SMB allows an authorized attacker to disclose information locally.
AnalysisAI
Uninitialized memory disclosure in the Windows SMB stack allows a locally authenticated attacker to read sensitive contents from uninitialized buffers, affecting Windows 10, Windows 11, and Windows Server 2012 through 2025. The flaw (CWE-908) resides in the SMB subsystem where a resource is consumed before being properly zeroed, leaking residual memory contents to a low-privileged local user. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must possess a valid, authenticated local user account on the target Windows system (PR:L per CVSS vector). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N, score 5.5 Medium) accurately characterizes a confined local-access threat: low complexity and no user interaction lower the barrier once inside, but the AV:L constraint requires the attacker to already be executing code locally on the target. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | A locally authenticated low-privilege user on an affected Windows system invokes SMB operations that trigger the uninitialized buffer code path, causing the SMB subsystem to return memory contents that were never zeroed during allocation. The attacker then parses the returned data to extract sensitive artifacts - such as fragments of other processes' memory, session tokens, or cryptographic material - present in the leaked region. … |
| Remediation | Apply the Microsoft-released security update via the advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50690, deployed through Windows Update, WSUS, Microsoft Update Catalog, or SCCM/Intune. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-908 – Use of Uninitialized Resource
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External POC / Exploit Code
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