EUVD-2026-43807
GHSA-54cf-prcc-99vc
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local kernel-driver code execution requires an existing low-privileged foothold (AV:L, PR:L), triggers without user interaction at low complexity, and yields full C/I/A impact.
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
Numeric truncation error in Windows Resilient File System (ReFS) allows an authorized attacker to execute code locally.
AnalysisAI
Local code execution in Microsoft's Resilient File System (ReFS) driver allows an authorized (low-privileged) attacker to run arbitrary code with elevated context via a numeric truncation flaw. The bug affects the ReFS component shipped with Windows 10, Windows 11, and Windows Server 2016 through 2025. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires local access to an affected Windows/Windows Server host and low-level privileges (CVSS PR:L), meaning the attacker must already be an authenticated/authorized local user or have code running on the machine - this is not remotely exploitable over the network. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score is 7.8 (High) with vector AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - local attack vector, low complexity, low privileges required, no user interaction, and high impact to confidentiality, integrity, and availability. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | A low-privileged user already logged onto a Windows host (or one who convinces a victim to mount an attacker-crafted ReFS volume such as a malicious VHD or removable disk) triggers the numeric truncation flaw during metadata parsing, corrupting kernel memory to execute code with elevated privileges. Because the vector is local with low complexity and no user interaction, exploitation is reliable once local access is obtained. … |
| Remediation | Patch available per vendor advisory - apply the Microsoft security update for your specific Windows/Windows Server SKU as published in the MSRC update guide (https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-49792); exact fixed build numbers are listed there per product and are not reproduced in the input data. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows 10, Windows 11, and Windows Server 2016-2025 systems across endpoints and servers, prioritizing production infrastructure; determine which systems are running ReFS. …
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External POC / Exploit Code
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