EUVD-2026-44264
GHSA-w2xr-m9cj-6q3w
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local privilege escalation from an existing low-privileged foothold (AV:L, PR:L), no user interaction, low complexity, yielding full SYSTEM-level C/I/A impact.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Heap-based buffer overflow in Windows Network File System allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Windows Network File System (NFS) component allows an authenticated attacker to elevate to SYSTEM by triggering a heap-based buffer overflow (CWE-122). Reported by Microsoft and affecting a broad range of Windows 10, Windows 11, and Windows Server 2012-2025 releases, with a vendor patch available via MSRC. …
Unlock full vulnerability intelligence
- Risk assessment & exploitation conditions
- Attack chain visualization
- Remediation with exact patch versions
- Threat intelligence from 22 sources
- Personal watchlist & email alerts
Free forever · No credit card required
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to already possess low-level local privileges on the host (PR:L) and the ability to run code that reaches the Windows NFS code path; no user interaction is needed (UI:N). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H (base 7.8, High) describes a local, low-complexity, low-privilege escalation with no user interaction and full confidentiality/integrity/availability impact - a textbook SYSTEM-privilege EoP. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has already gained low-privileged code execution on a Windows host - for example via a phished user session or a compromised low-privilege service account - invokes the vulnerable NFS code path to overflow a heap buffer and corrupt kernel/service memory, gaining SYSTEM. No public exploit is identified at time of analysis, so this would require custom exploit development, and the low attack complexity (AC:L) suggests reliable exploitation is achievable once the primitive is understood. |
| Remediation | Patch available per vendor advisory: apply the Microsoft security update for CVE-2026-56650 for each affected OS build via Windows Update / WSUS; consult https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56650 for the exact KB and patched build number per SKU (the input does not specify a single fix version, so use the MSRC per-product build). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Immediately conduct an inventory of Windows 10, 11, and Server 2012-2025 systems with NFS enabled to establish baseline exposure. …
Sign in for detailed remediation steps and compensating controls.
Threat intelligence, references, and detailed analysis are available after sign-in.
More in Windows 10 Version 1607
View allLocal privilege escalation in Microsoft Active Directory Federation Services (AD FS) lets an already-authenticated low-p
Local privilege escalation in the Microsoft Windows Kernel allows an unauthorized attacker to gain elevated (SYSTEM-leve
Local privilege escalation in the Windows Win32K kernel subsystem (CWE-122 heap-based buffer overflow) lets an already-a
Local code execution in the Windows DHCP Client service stems from a use-after-free (CWE-416) memory-corruption flaw aff
Local code execution in the Microsoft Message Queuing (MSMQ) Queue Manager affects a broad range of Windows client and s
Remote code execution in the Microsoft Windows DHCP Server role allows an unauthenticated network attacker to run arbitr
Elevation of privilege in the Windows NTFS file-system driver lets an already-authenticated local user escalate to SYSTE
Local code execution in the Windows Media component of supported Windows 10, Windows 11, and Windows Server (2016 throug
Elevation of privilege in the Windows Hyper-V virtual network switch (VMSwitch) lets an authenticated attacker operating
Remote code execution in the Windows Server Network driver stems from a race condition (CWE-362) that lets an unauthoriz
Remote code execution in Microsoft Windows Remote Desktop (RDP) allows an unauthorized network attacker to run arbitrary
Remote code execution in Microsoft Windows Message Queuing (MSMQ) allows an unauthenticated attacker to run arbitrary co
Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Heap Overflow
View allShare
External POC / Exploit Code
Leaving vuln.today