EUVD-2026-43898
GHSA-f6fr-mv24-3g66
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local code execution as a standard user is required (AV:L, PR:L) with no user interaction (UI:N); a successful kernel heap overflow yields full SYSTEM control, so C/I/A are all High.
Primary rating from Vendor (microsoft).
CVSS VectorNVD
Lifecycle Timeline
5DescriptionNVD
Heap-based buffer overflow in Windows DirectX allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Windows DirectX graphics component affects a broad range of Microsoft Windows client and server builds (Windows 10 1809 through Windows 11 26H1, and Windows Server 2019 through 2025). An authenticated local attacker who can run code on the host triggers a heap-based buffer overflow (CWE-122) to gain SYSTEM-level privileges, achieving total confidentiality, integrity, and availability impact. Reported by Microsoft with a patch available; there is no public exploit identified at time of analysis, and EPSS is modest at 1.50% (71st percentile).
Technical ContextAI
The flaw resides in DirectX, the Windows graphics and multimedia subsystem whose kernel-mode components (notably the DirectX Graphics Kernel, dxgkrnl.sys) process user-supplied graphics buffers and are reachable from low-privileged user contexts. The root cause is CWE-122, a heap-based buffer overflow: memory allocated on the heap is written past its bounds, typically due to insufficient validation of an attacker-influenced size or offset when handling DirectX objects or command buffers. Because the vulnerable code executes in a privileged kernel context, corrupting adjacent heap structures can be leveraged to overwrite control data and hijack execution at the OS privilege level. The CPE set confirms the affected surface is the core OS across Windows 10 (1809/21H2/22H2), Windows 11 (24H2/25H2/26H1), and Windows Server 2019/2022/2025 including Server Core installations.
RemediationAI
Apply the Microsoft security update for CVE-2026-50375 via Windows Update; Vendor-released patch: update to at least the fixed build for each edition - Windows 10 1809 / Server 2019 to 10.0.17763.9020, Windows 10 21H2 to 10.0.19044.7548, Windows 10 22H2 to 10.0.19045.7548, Windows Server 2022 to 10.0.20348.5386, Windows 11 24H2 to 10.0.26100.8875 and Server 2025 to 10.0.26100.33158, Windows 11 25H2 to 10.0.26200.8875, and Windows 11 26H1 to 10.0.28000.2269, as documented at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50375. There is no vendor-published pre-patch workaround for a heap overflow in a core graphics component; as compensating controls until patching, restrict local/interactive logon and code-execution rights on shared and multi-user systems (terminal/RDP servers, jump hosts) to limit who can reach the vulnerable local vector, and enforce least privilege so untrusted accounts cannot run arbitrary code - noting the trade-off that these controls reduce exposure but do not remove the vulnerability and may impact legitimate user workflows. Prioritize Server Core and RDS hosts where multiple users share a machine.
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Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Buffer Overflow
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External POC / Exploit Code
Leaving vuln.today