EUVD-2026-56363
GHSA-xmjv-hhr3-54jq
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Local access with low-privilege code execution required; buffer over-read yields kernel memory disclosure only, with no write or availability impact.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Buffer over-read in Windows Win32K allows an authorized attacker to disclose information locally.
AnalysisAI
Information disclosure in Windows Win32K affects a broad range of Microsoft Windows client and server operating systems, from Windows Server 2012 through Windows 11 26H1 and Server 2025. A locally authenticated low-privilege user can trigger a buffer over-read (CWE-126) in the Win32K kernel-mode subsystem, causing the kernel to return out-of-bounds memory contents to user space. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a locally authenticated account with at least low-level user privileges (PR:L per CVSS vector AV:L/AC:L/PR:L/UI:N); remote unauthenticated exploitation is not possible. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS base score of 5.5 (Medium) correctly reflects the local-only attack vector and the exclusively confidentiality-impacting nature of this flaw (C:H/I:N/A:N); no integrity or availability degradation is possible. … 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 the vendor-released patches from Microsoft's Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62746. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-126 – Buffer Over-read
View allSame technique Buffer Overflow
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External POC / Exploit Code
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