EUVD-2026-56368
GHSA-v572-8pwj-5gcg
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local access with low privileges required; kernel heap overflow yields full C/I/A impact; scope unchanged as exploit does not pivot to other systems.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Heap-based buffer overflow in Windows HTTP.sys allows an authorized attacker to elevate privileges locally.
AnalysisAI
Privilege escalation via heap-based buffer overflow in Windows HTTP.sys affects a broad range of Windows 10, 11, and Windows Server releases. An attacker with low-level local access can exploit the CWE-122 flaw in the kernel-mode HTTP driver to achieve full system compromise - High confidentiality, integrity, and availability impact. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must hold a valid, low-privileged local account on the target Windows system (PR:L - some form of authenticated local access is required). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) scores 7.8 and correctly characterizes this as a local, low-complexity privilege escalation requiring minimal privileges. … 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 | The primary fix is applying Microsoft's cumulative update for the affected Windows build. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all Windows 10, 11, and Windows Server systems in your environment potentially affected by CVE-2026-62739. …
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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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