EUVD-2026-44066
GHSA-5qqr-8vg7-hvq7
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local, low-privilege kernel-parsing flaw with no user interaction (AV:L/PR:L/UI:N) yielding kernel code execution, hence full C/I/A impact and unchanged scope.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Heap-based buffer overflow in Windows NTFS allows an authorized attacker to execute code locally.
AnalysisAI
Local privilege escalation to code execution in the Windows NTFS driver (CVE-2026-50417) allows an authenticated attacker with low privileges to corrupt heap memory and run arbitrary code on affected Windows 10, Windows 11, and Windows Server 2012 through 2025 systems. The flaw is a heap-based buffer overflow (CWE-122) reported by Microsoft, with CVSS 7.8 (High) reflecting local vector, low complexity, and full confidentiality/integrity/availability impact. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires local access to the target (AV:L) and prior authentication with at least low privileges (PR:L) - the attacker must already be able to run code or interact with the NTFS subsystem as a logged-on user, so this is a privilege-escalation primitive, not a remote entry point. … 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:H/A:H, base 7.8) describes a locally-exploitable, low-complexity, low-privilege flaw with high impact across all three security properties - consistent with kernel-level code execution used for privilege escalation. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who already has a low-privileged foothold on a Windows host (e.g., a standard user account, a compromised service, or an RDS session) triggers a crafted NTFS operation - such as mounting a malicious disk image or accessing specially structured filesystem metadata - that overflows a heap allocation in the NTFS kernel driver. The resulting memory corruption is leveraged to execute code in kernel context, escalating from limited user rights to SYSTEM. … |
| Remediation | Vendor-released patch: available per the Microsoft Security Response Center advisory - apply the monthly cumulative security update that addresses CVE-2026-50417 for your specific Windows build via Windows Update, WSUS, or your patch-management tooling, referencing https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50417 for the exact KB numbers per SKU. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows 10, Windows 11, and Windows Server 2012 through 2025 systems in your environment and assess patch compatibility with business-critical applications. …
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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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