EUVD-2026-56389
GHSA-rhm8-g2rj-mrwc
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Local access with low privileges required; confidentiality-only impact from kernel memory read; no integrity or availability effect.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Out-of-bounds read in Windows NTFS allows an authorized attacker to disclose information locally.
AnalysisAI
Out-of-bounds read in the Windows NTFS driver exposes sensitive memory contents to locally authenticated attackers across a wide range of Microsoft Windows and Windows Server releases. The flaw (CWE-125) allows a low-privileged local user to read kernel or process memory beyond intended boundaries, resulting in information disclosure with high confidentiality impact but no integrity or availability consequences. No public exploit code has been identified at time of analysis, and CISA SSVC rates exploitation as none with partial technical impact.
Technical ContextAI
The vulnerability resides in the Windows NT File System (NTFS) driver, a core kernel-mode component responsible for parsing and handling the NTFS volume format used ubiquitously across Windows desktop and server installations. CWE-125 (Out-of-bounds Read) indicates that the driver reads data past the boundary of an allocated buffer - a class of flaw typically arising from missing or incorrect length validation when processing NTFS metadata structures (e.g., MFT records, attribute headers, or directory entries). Because NTFS parsing occurs in kernel space, an out-of-bounds read can expose kernel memory contents, including potentially sensitive data such as credentials, encryption keys, or ASLR-defeating layout information. The attack surface is local: an authenticated user must be able to trigger NTFS operations, which is generally achievable by mounting or interacting with a crafted NTFS volume or file. Affected CPE ranges span Windows 6.2 through 10.0.28000 builds across both client and server SKUs.
RemediationAI
Apply the Microsoft security update corresponding to your Windows version as documented in the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62796. The patch is confirmed available from the vendor; exact fixed build numbers are listed per-SKU in the EUVD affected-versions data (e.g., Windows Server 2025 fixed at 10.0.26100.33296, Windows 10 22H2 fixed at 10.0.19045.7663, Windows 11 23H2 fixed at 10.0.22631.7517). Organizations unable to patch immediately should prioritize restricting local interactive and remote desktop access for untrusted or low-privilege users on sensitive systems, as the vulnerability requires local authenticated access. Disabling the ability to mount arbitrary NTFS volumes (e.g., blocking removable media or virtual disk attachment) can reduce the attack surface on servers where this is operationally feasible, though this is a non-trivial operational change. Windows Server 2012 and 2012 R2 are outside mainstream support; extended security update (ESU) coverage should be verified before assuming patch availability.
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Same weakness CWE-125 – Out-of-bounds Read
View allSame technique Buffer Overflow
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External POC / Exploit Code
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