EUVD-2026-43799
GHSA-rgjm-qw7c-8gxf
Severity by source
AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Local NTFS parsing flaw reachable without privileges or interaction per the description (AV:L, PR:N, UI:N), low complexity, yielding full code execution and thus C/I/A High.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/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 Microsoft Windows NTFS (New Technology File System) stems from a heap-based buffer overflow (CWE-122) that lets a local attacker run arbitrary code with high confidentiality, integrity, and availability impact. The flaw affects a broad range of Windows client and server builds - from Windows 10 1607 and Server 2012 through Windows 11 26H1 and Server 2025 - and Microsoft has released a patch. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires local access to the target system and the NTFS driver processing attacker-controlled filesystem metadata - in practice a crafted NTFS volume delivered via a mounted VHD/VHDX image, removable media, or malformed disk structure. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The provided CVSS 3.1 vector (AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H, score 8.4) describes a locally-reachable, low-complexity flaw requiring no privileges and no user interaction, yielding full C/I/A impact - effectively a local privilege-escalation / code-execution primitive. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker with the ability to introduce crafted NTFS metadata - for example by convincing a user to mount a malicious VHDX file, insert a specially formatted USB drive, or open an attacker-supplied disk image - triggers the heap overflow in the NTFS driver as it parses the volume. Given AV:L/AC:L, exploitation is low-complexity once the malformed filesystem is processed, allowing the attacker to execute code in the privileged parsing context. … |
| Remediation | Patch available per vendor advisory - apply the Microsoft security update for CVE-2026-49184 delivered through the monthly cumulative/quality update for your specific Windows build, referencing https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-49184 for the exact patched build numbers per SKU (exact fix version is not enumerated in the input data, only in the MSRC guide). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all affected Windows systems including Windows 10 1607 through 26H1, Windows 11, and Windows Server 2012 through 2025, prioritizing production servers and systems with elevated access privileges. …
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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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