EUVD-2026-43778
GHSA-p6p6-5fqr-x4hg
Severity by source
AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
Local heap overflow needing an authenticated low-privilege user plus interaction to process crafted NTFS data (AV:L/PR:L/UI:R), yielding full code execution (C:H/I:H/A:H).
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Heap-based buffer overflow in Windows NTFS allows an authorized attacker to execute code locally.
AnalysisAI
Local code execution in Microsoft Windows NTFS driver allows an authenticated attacker to run arbitrary code by triggering a heap-based buffer overflow (CWE-122) after inducing user interaction. The flaw affects a broad range of Windows client and server releases, from Windows 10 1607 and Windows Server 2012 through Windows 11 26H1 and Windows Server 2025. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires local access to the system with at least low-privilege authenticated access (CVSS PR:L) and user interaction (CVSS UI:R): the attacker must get a user to open, mount, or otherwise process a crafted NTFS file system structure that reaches the vulnerable heap-parsing code in the NTFS driver. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score is 7.3 (High) with vector AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H, meaning exploitation requires local access, low privileges, and user interaction but yields high confidentiality, integrity, and availability impact in an unchanged scope. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | A low-privileged user - or an attacker who has compromised such an account - presents a maliciously crafted NTFS structure, for example a booby-trapped disk image or file that the victim opens or mounts, causing NTFS to overflow a heap buffer while parsing it and execute attacker-controlled code on the host. Because the CVSS vector specifies AV:L with UI:R, the attacker needs local access and must induce a user action, making this a plausible privilege-escalation or post-foothold step rather than a remote drive-by. … |
| Remediation | Apply the Microsoft security update for CVE-2026-58640 via Windows Update or WSUS; Vendor-released patch is available, and the exact fixed build/KB numbers for each affected OS version are enumerated in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58640 - cite those per-build versions rather than any invented number. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Inventory all affected Windows systems (Windows 10 1607+, Windows 11, Windows Server 2012 through 2025) and assess organizational exposure. …
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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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