EUVD-2026-73664
GHSA-fmm5-9jvw-32hg
Severity by source
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Network-reachable client-side UAF requires heap grooming precision (AC:H); no attacker auth or user interaction needed once client connects to malicious server.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Use after free in Windows SMB Client allows an unauthorized attacker to execute code over a network.
AnalysisAI
Use-after-free in the Windows SMB Client component enables unauthenticated remote code execution against a broad range of Windows 11 and Windows Server builds. An attacker operating a malicious SMB server can trigger a freed-memory dereference during client-side protocol processing, yielding arbitrary code execution with a full C:H/I:H/A:H impact triad. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The Windows SMB Client must establish or be coerced into establishing a connection to an attacker-controlled SMB server - this is a client-side vulnerability, not a server-side one. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 8.1 score (AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H) accurately characterizes high severity tempered by meaningful exploitation complexity. … 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 cumulative update for the affected Windows build: Windows 11 24H2 and Windows Server 2025 to build 10.0.26100.9445 or later, Windows 11 23H2 to 10.0.22631.7582 or later, Windows 11 25H2 to 10.0.26200.9445 or later, Windows 11 26H1 to 10.0.28000.2954 or later, and Windows Server 2022 to 10.0.20348.5622 or later. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Audit all Windows 11 and Windows Server systems (on-premises and cloud-hosted) to identify current cumulative update levels and establish a baseline of exposure. …
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Same weakness CWE-416 – Use After Free
View allSame technique Denial Of Service
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External POC / Exploit Code
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