Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Description states unauthenticated network information disclosure, so AV:N/PR:N/UI:N; impact is confidentiality-only (C:H) with no integrity or availability effect.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Lifecycle Timeline
2DescriptionCVE.org
Out-of-bounds read in Windows Kernel allows an unauthorized attacker to disclose information over a network.
AnalysisAI
Information disclosure in the Windows Kernel allows a remote, unauthenticated attacker to read out-of-bounds memory and leak sensitive data across all currently supported Windows client and server builds (Windows 10 1809/21H2/22H2, Windows 11 24H2/25H2/26H1, and Windows Server 2019/2022/2025). The CVSS 3.1 base score is 7.5 (AV:N/AC:L/PR:N/UI:N, high confidentiality impact only). …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Per CVSS AV:N/AC:L/PR:N/UI:N, exploitation requires no authentication, no user interaction, and only network reachability to the affected Windows Kernel service on a supported build (Windows 10 1809/21H2/22H2, Windows 11 24H2/25H2/26H1, or Windows Server 2019/2022/2025). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The signals are moderately consistent but incomplete. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker with network access to an affected Windows host sends crafted traffic to a kernel-serviced endpoint that triggers the out-of-bounds read, causing the kernel to return adjacent memory contents in a response or observable side channel. Repeating the request lets the attacker harvest sensitive memory such as pointers or secrets, potentially bypassing address-space randomization to enable follow-on attacks. … |
| Remediation | Apply the Microsoft security update for CVE-2026-50463; the vendor advisory confirms a patch is available, and the exact fixed build numbers per SKU should be taken directly from Microsoft's Security Update Guide at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50463 (specific fixed version not enumerated in the supplied data, so do not substitute an assumed build). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify and document all Windows 10, 11, 2019, 2022, and 2025 systems in your environment, confirming patch availability and deployment constraints. …
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External POC / Exploit Code
Leaving vuln.today
EUVD-2026-43918
GHSA-4gmx-836j-jvhf