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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 filesystem-parsing bug triggered by mounting an attacker-supplied volume, so AV:L and UI:R with PR:N; kernel-context overflow 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:A/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 - 18:52 vuln.today
CVE Published
Jul 14, 2026 - 17:09 nvd
HIGH 7.8

DescriptionCVE.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 attacker run arbitrary code by inducing a victim to mount or open a maliciously crafted ReFS volume. The flaw is a heap-based buffer overflow (CWE-122) in ReFS metadata parsing affecting Windows 10, Windows 11 (through 26H1), and Windows Server 2016-2025. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Craft malicious ReFS volume
Delivery
Deliver via media or download
Exploit
Victim mounts the volume
Execution
Overflow heap in ReFS parser
Impact
Execute code with kernel privileges

Vulnerability AssessmentAI

Exploitation Exploitation requires the victim to mount or open an attacker-crafted ReFS-formatted volume (such as a malicious VHD/VHDX image or removable disk) so the vulnerable ReFS driver parses its metadata - this is the concrete UI:R condition. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 3.1 vector (AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H, 7.8 High) describes a local attack requiring no prior privileges (PR:N) but mandatory user interaction (UI:R) - consistent with a filesystem-parsing bug that fires when a user mounts an attacker-supplied volume rather than over the network. … 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 image or a USB drive) whose on-disk metadata triggers the heap overflow, then delivers it to a victim via email, download, or physical media. When the user double-clicks or otherwise mounts the volume, the ReFS driver parses the malformed structures and executes attacker-controlled code with elevated (kernel) privileges. …
Remediation Apply the Microsoft security update for CVE-2026-58530 to all affected Windows client and server builds; a patch is available per the vendor advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58530 (consult that page for the exact per-build KB numbers, as an exact fixed version string was not provided in the input). … 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 and identify those with ReFS driver exposure; disable or restrict ReFS driver functionality on systems where it is not operationally required. …

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CVE-2026-58530 vulnerability details – vuln.today

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