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Windows ReFS CVE-2026-50501

| EUVDEUVD-2026-44109 HIGH
Stack-based Buffer Overflow (CWE-121)
2026-07-14 microsoft GHSA-572g-ggww-38vc
7.8
CVSS 3.1 · Vendor: microsoft
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Severity by source

Vendor (microsoft) PRIMARY
7.8 HIGH
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
vuln.today AI
7.8 HIGH

Local parsing of a crafted ReFS image requires victim interaction (AV:L, UI:R) but no attacker privileges (PR:N); driver-context code execution yields full C/I/A impact.

3.1 AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
4.0 AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

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
Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

2
Analysis Generated
Jul 14, 2026 - 19:57 vuln.today
CVE Published
Jul 14, 2026 - 17:07 cve.org
HIGH 7.8

DescriptionCVE.org

Stack-based buffer overflow in Windows Resilient File System (ReFS) allows an unauthorized attacker to execute code locally.

AnalysisAI

Local code execution in Microsoft's Resilient File System (ReFS) driver affects Windows 11 (24H2, 25H2, 26H1) and Windows Server 2025, where a stack-based buffer overflow (CWE-121) can be triggered when a victim interacts with attacker-crafted ReFS data. The CVSS 3.1 vector (AV:L/AC:L/PR:N/UI:R) shows an unauthenticated but user-interaction-dependent local attack yielding full confidentiality, integrity, and availability impact. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Craft malicious ReFS volume image
Delivery
Deliver image to target user
Exploit
User mounts crafted ReFS volume
Execution
Overflow stack buffer in ReFS driver
Persist
Hijack control flow
Impact
Execute code in user context

Vulnerability AssessmentAI

Exploitation Exploitation requires local delivery of a crafted ReFS artifact and victim interaction (CVSS UI:R) - specifically, the victim must mount, open, or otherwise cause the ReFS driver to parse an attacker-supplied ReFS-formatted volume or virtual disk image; there is no remote or network-triggered path (AV:L). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS base score is 7.8 (High) with a local attack vector, low complexity, no privileges required, but mandatory user interaction (UI:R) and unchanged scope, giving high C/I/A impact - consistent with a 'user must open or mount a malicious ReFS volume/image' pattern rather than a remotely wormable bug. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker crafts a malicious ReFS-formatted disk image (e.g. a VHDX or removable volume) with corrupted metadata and delivers it to a victim via download, email, or removable media. …
Remediation Patch available per vendor advisory: apply the Microsoft security update referenced at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50501 for your specific Windows 11 (24H2/25H2/26H1) or Windows Server 2025 build via Windows Update or WSUS as the primary fix; the exact patched build/KB number was not included in the provided data and should be confirmed on the MSRC page before deployment. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours, identify all Windows 11 (24H2, 25H2, 26H1) and Windows Server 2025 systems across the organization and confirm patch availability from Microsoft. …

Sign in for detailed remediation steps and compensating controls.

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CVE-2026-50501 vulnerability details – vuln.today

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