EUVD-2026-43799
GHSA-rgjm-qw7c-8gxf
Vulnerability Assessment
| Weakness |
CWE
ASVS 5.0
V15 - Secure Coding and Architecture Heap buffer bounds checking
MITRE ATT&CK
1 technique across 1 tactic: Execution The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
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Alert meAnalysisAIv2 – Jul 20, 2026
Local privilege escalation in the Windows NTFS filesystem driver (CWE-122 heap-based buffer overflow) lets a locally authenticated attacker corrupt kernel heap memory and execute arbitrary code, per Microsoft's CVSS 3.1 vector (AV:L/PR:L). Affected builds span Windows 10 (1607 through 22H2), Windows 11 (24H2/25H2/26H1), and Windows Server 2012 through 2025. There is no public exploit identified at time of analysis and CISA SSVC rates current exploitation as 'none', with a low EPSS score of 0.29% (21st percentile), though the technical impact is rated 'total'.
Earlier versions of this analysis (1)
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. There is no public exploit identified at time of analysis and it is not listed in CISA KEV, but NTFS's role as the default Windows filesystem makes the exposed surface extremely wide.
Affected VersionsENISA
Affected Packages
Source: OSV (Open Source Vulnerabilities)
Affects your stack
Affects 18 packages in euvd
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- Exploit and PoC references, threat intelligence from 22 sources
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Severity by source
AV:L/AC:L/PR:L/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 VectorNVD
Lifecycle Timeline
2DescriptionNVD
Heap-based buffer overflow in Windows NTFS allows an unauthorized attacker to execute code locally.
Executive ViewAI
Windows NTFS filesystem driver vulnerability (CVE-2026-49184) affects Windows 10, 11, and Server platforms, allowing any locally authenticated user to escalate from low privileges to kernel-level code execution. This represents a significant internal risk: any employee or contractor with system access could compromise sensitive data, bypass security controls, and move laterally across your infrastructure. While no active public exploitation has been observed, the ease of privilege escalation from standard user accounts makes this a priority patch.
Within 24 hours, inventory all Windows 10 (versions 1607-22H2), Windows 11, and Windows Server (2012 through 2025) systems in your infrastructure. Within 7 days, deploy Microsoft's vendor patch to test and non-production environments to validate compatibility. Within 30 days, complete patching of all production systems according to your change management process, prioritizing servers and workstations with privileged user accounts.
Apply vendor patch.
Threat Intelligence Overview
NVD
CVE.org
EPSS
Vulnrichment
VulDB
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
A buffer overflow occurs when a program writes more data to a memory buffer than it was allocated to hold, causing the excess data to spill into adjacent memory regions.
A heap overflow occurs when a program writes data beyond the bounds of a buffer allocated in the heap memory region.
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