EUVD-2026-43812
GHSA-7fcf-6p48-fvvr
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Local NTFS parsing flaw needing a user to open/mount crafted content (AV:L, UI:R), no attacker privileges (PR:N), with full kernel-context code execution giving high C/I/A.
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 NTFS allows an unauthorized attacker to execute code locally.
AnalysisAI
Local code execution in the Windows NTFS driver (CVE-2026-49797) allows an attacker with local access to run arbitrary code by tricking a user into interacting with a maliciously crafted NTFS artifact, exploiting a heap-based buffer overflow (CWE-122). The flaw affects a broad range of Windows client and server releases from Windows 10 1607 and Server 2012 through Windows 11 26H1 and Server 2025. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires local delivery of a crafted NTFS artifact and mandatory user interaction (CVSS UI:R): a user must open or mount the attacker-supplied file, disk image, or NTFS volume so the NTFS driver parses the malicious metadata. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 score is 7.8 (High) with vector AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - local attack vector, low complexity, no privileges required, but user interaction is required, with high confidentiality, integrity, and availability impact and no scope change. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker crafts a malicious NTFS artifact - such as a specially formed disk image, VHD, or file with corrupted NTFS metadata - and delivers it to a victim by email, download, or removable media. When the user opens or mounts the artifact, the NTFS driver parses the malformed structures and triggers the heap overflow in kernel context, allowing the attacker's code to execute on the system. … |
| Remediation | Apply the Microsoft security update for CVE-2026-49797 via the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-49797; a vendor patch is available, and administrators should deploy the corresponding monthly cumulative update / KB for each affected Windows 10, Windows 11, and Windows Server 2012-2025 build through Windows Update or WSUS/SCCM. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows systems running Windows 10 (1607 and later), Windows 11, or Windows Server 2012-2025 to determine organizational exposure to CVE-2026-49797. …
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Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Heap Overflow
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External POC / Exploit Code
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