EUVD-2026-44071
GHSA-qmfc-cvq2-hfwh
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Local delivery of a crafted volume (AV:L) that the victim must mount (UI:R) with no auth (PR:N); kernel-context code execution gives full C/I/A impact.
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 Resilient File System (ReFS) allows an unauthorized attacker to execute code locally.
AnalysisAI
Local code execution in Microsoft Windows' Resilient File System (ReFS) driver lets an unauthorized attacker run arbitrary code by inducing a victim to mount or open a maliciously crafted ReFS volume (CVE-2026-50362). The flaw affects the ReFS component shipped across Windows 10, Windows 11 (through 26H1), and Windows Server 2016-2025, carries CVSS 7.8, and requires user interaction (UI:R) with no prior authentication (PR:N). …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the victim to mount or open an attacker-crafted ReFS volume (a malicious VHD/VHDX image, removable disk, or storage device with malformed ReFS metadata) on a host whose ReFS driver parses it - the UI:R metric confirms user interaction is mandatory and AV:L confirms the attacker must deliver the volume locally rather than reach it over a network. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H yields 7.8 (High), driven by full confidentiality, integrity, and availability impact but offset by a local attack vector and required user interaction. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker crafts a malicious ReFS-formatted volume - for example a VHDX disk image or a USB drive with corrupted ReFS metadata - and delivers it to a victim via email, download, or physical media. When the user mounts or opens the volume, the ReFS driver parses the malformed metadata, triggers the heap overflow in kernel memory, and executes attacker-controlled code. … |
| Remediation | Patch available per vendor advisory - apply the Microsoft security update for CVE-2026-50362 for the specific Windows or Windows Server build in use, which is delivered through the monthly cumulative update; consult https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50362 for the exact fixed build number matching each affected version. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all systems running Windows 10, 11, or Windows Server 2016-2025 and assess ReFS usage; prioritize systems with higher user interaction or sensitive data exposure. …
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External POC / Exploit Code
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