EUVD-2026-44102
GHSA-ggf5-x436-r699
Severity by source
AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Local authenticated low-priv attacker (AV:L/PR:L) triggers a kernel heap overflow with no user interaction, crossing the user-to-kernel boundary (S:C) for full SYSTEM compromise (C/I/A:H).
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Heap-based buffer overflow in Windows Win32K allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Windows Win32K kernel subsystem (CWE-122 heap-based buffer overflow) lets an already-authenticated low-privileged attacker corrupt kernel heap memory and gain SYSTEM-level control across a broad range of Windows client and server releases. The flaw carries a CVSS 3.1 base score of 8.8 with a changed scope (S:C), reflecting that a user-mode process can compromise the kernel security boundary. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to already possess local, authenticated low-privileged code execution on the target host (CVSS PR:L, AV:L) - this is a post-compromise privilege-escalation primitive, not a remote entry point, so it cannot be triggered across the network or via a lure alone. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS vector (AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H) describes a low-complexity, locally-launched attack requiring only low existing privileges and no user interaction, yielding full confidentiality, integrity, and availability impact with a scope change into the kernel - a classic high-value EoP profile scoring 8.8. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has already gained a low-privileged foothold on a Windows host - for example through a phishing payload running as a standard user or a compromised low-privilege service account - invokes a crafted sequence of Win32K syscalls that triggers the heap-based buffer overflow. By grooming the kernel pool and corrupting an adjacent object, they overwrite a token or pointer to execute code in kernel context and escalate to SYSTEM. … |
| Remediation | Apply the Microsoft security update for CVE-2026-50489 (patch available per vendor advisory; consult the MSRC Update Guide at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50489 for the exact KB and build number for each affected OS, as the input does not specify a single fix version). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, enumerate all Windows client and server systems and verify patch availability from Microsoft for CVE-2026-50489; immediately prioritize production servers and systems handling sensitive data for patching. …
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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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