EUVD-2026-56434
GHSA-63q3-2937-wf8v
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Local-only reach, low-privilege authenticated trigger, no integrity or availability impact - confidentiality disclosure only, consistent with GDI memory read.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Out-of-bounds read in Windows GDI allows an authorized attacker to disclose information locally.
AnalysisAI
Windows GDI (Graphics Device Interface) exposes an out-of-bounds read flaw exploitable by any locally authenticated, low-privileged user across a broad span of Windows releases - from Windows 10 Version 1607 and Windows Server 2012 through Windows 11 26H1 and Windows Server 2025. Successful exploitation yields high-confidence memory disclosure (C:H per CVSS), enabling an attacker to read memory contents beyond the intended GDI buffer boundary, potentially exposing credentials, session material, or cryptographic data. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authenticated local session with at minimum low-privilege access (PR:L per the provided CVSS vector, AV:L). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 5.5 medium rating is well-calibrated for this vulnerability: the local-only attack vector (AV:L) eliminates direct remote exploitation, and low-privilege authentication (PR:L) means an attacker must already have a foothold on the target system. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply Microsoft's vendor-released patches via Windows Update or the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-65662. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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