EUVD-2026-44080
GHSA-883g-v6rj-hm53
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:L
Network-reachable unauthenticated over-read needing no interaction (AV:N/AC:L/PR:N/UI:N); high confidentiality leak with minor availability effect and no integrity impact.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
2DescriptionCVE.org
Out-of-bounds read in Windows Kernel allows an unauthorized attacker to disclose information over a network.
AnalysisAI
Remote information disclosure in the Microsoft Windows Kernel (CWE-125 out-of-bounds read) lets an unauthenticated attacker read kernel memory over a network, per the CVSS AV:N/PR:N vector, affecting a broad range of Windows 10, Windows 11, and Windows Server 2016 through 2025 builds. The flaw carries high confidentiality impact (C:H) with a minor availability side effect and no integrity impact, scoring CVSS 8.2. No public exploit is identified at time of analysis and it is not in CISA KEV, but the network-reachable, no-authentication, no-interaction profile makes it a notable patch priority.
Technical ContextAI
The defect is an out-of-bounds read (CWE-125) in the Windows Kernel, the privileged core that mediates memory management, process scheduling, and I/O across all Windows editions. An out-of-bounds read occurs when code reads past the intended bounds of a buffer, returning adjacent kernel memory that may contain uninitialized data, pointers, or secrets useful for defeating mitigations such as KASLR. The CPE data confirms the affected surface spans the client kernel in Windows 10 (1607, 1809, 21H2, 22H2) and Windows 11 (24H2, 25H2, 26H1), plus the server kernel in Windows Server 2016, 2019, 2022, and 2025 including Server Core installations. Microsoft's tagging of this as both 'Information Disclosure' and 'Buffer Overflow' reflects an over-read that leaks memory rather than corrupting it, consistent with the I:N metric.
RemediationAI
Patch available per vendor advisory: apply the Microsoft security update for CVE-2026-50429 referenced at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50429, selecting the cumulative update matching each affected build (Windows 10 1607-22H2, Windows 11 24H2-26H1, and Windows Server 2016-2025 including Server Core); take exact patched build numbers from the MSRC page rather than assuming them. Because this is a kernel update, prioritize deployment on internet-exposed and multi-tenant servers first and schedule the required reboot during a maintenance window. As a compensating control until patching completes, restrict network exposure of affected hosts by limiting inbound access to the specific service(s) that reach the vulnerable kernel path using host and perimeter firewalls plus network segmentation; the trade-off is that filtering may disrupt legitimate remote services, and because the exact triggering component is not named in the supplied data, blanket segmentation from untrusted networks is the safest interim measure.
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Same weakness CWE-125 – Out-of-bounds Read
View allSame technique Buffer Overflow
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External POC / Exploit Code
Leaving vuln.today