EUVD-2026-56666
GHSA-54rj-g9cv-7m8j
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Network-reachable SMB with low-privilege auth required; no interaction needed; full CIA impact upon successful kernel-mode code execution.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
3DescriptionCVE.org
Heap-based buffer overflow in Windows SMB Server allows an authorized attacker to execute code over a network.
AnalysisAI
Remote code execution in Windows SMB Server is achievable by a network-authenticated attacker exploiting a heap-based buffer overflow (CWE-122). The CVSS vector (AV:N/AC:L/PR:L/UI:N) confirms that low-privileged, network-accessible credentials are sufficient - no user interaction or elevated rights are required. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must possess at least low-privilege network credentials valid on the target system (PR:L per CVSS), meaning unauthenticated exploitation is not possible. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This vulnerability presents a high real-world risk profile, not merely a high CVSS score. … 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 Microsoft security update corresponding to the affected Windows build immediately, targeting the specific fixed build numbers listed per version above (e.g., Windows Server 2025 to 10.0.26100.33296 or later, Windows 11 24H2 to 10.0.26100.9168 or later). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows Server 2012-2025 and Windows 11 26H2 systems with network access; prioritize domain controllers, file servers, and systems handling sensitive data. …
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Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Heap Overflow
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External POC / Exploit Code
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