EUVD-2026-56670
GHSA-x6j8-jr69-3r2m
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Local access and a low-privilege account are required to trigger the NTFS over-read; impact is read-only memory disclosure with no integrity or availability consequence.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Lifecycle Timeline
3DescriptionCVE.org
Buffer over-read in Windows NTFS allows an authorized attacker to disclose information locally.
AnalysisAI
Information disclosure in the Windows NTFS filesystem driver allows a local low-privileged attacker to read beyond buffer boundaries and expose sensitive memory contents. Affecting virtually every supported Windows desktop and server release - from Windows 10 1607 through Windows Server 2025 and Windows 11 26H1 - the vulnerability requires only a standard local user account and no special configuration, making it a realistic threat in multi-tenant, shared, or cloud environments where local access is granted to semi-trusted users. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a valid, authenticated local user account on the target Windows system (PR:L per CVSS vector); remote unauthenticated exploitation is not possible given AV:L. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 5.5 Medium score is calibrated correctly for this class of vulnerability: the AV:L constraint prevents remote exploitation, and the PR:L requirement means an attacker must already hold a valid local account, which is a meaningful prerequisite in well-administered environments. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | A low-privileged user logged into an unpatched Windows system - via interactive session, RDP, or a terminal service - submits a crafted filesystem operation targeting the NTFS driver that causes it to read beyond its intended buffer boundary. The overread returns adjacent kernel pool memory contents to the calling process, potentially exposing cached credentials, session tokens, or sensitive file data from co-resident processes. … |
| Remediation | The primary remediation is to apply the Microsoft-issued security update for your specific Windows version via Windows Update, WSUS, or Microsoft Update Catalog. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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