EUVD-2026-56335
GHSA-8vjh-2wg9-ph96
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local vector and low-privilege requirement reflect authenticated local code execution needed; full C/I/A impact corresponds to SYSTEM-level privilege escalation in kernel context.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
3DescriptionCVE.org
Integer overflow or wraparound in Windows HTTP.sys allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in Windows HTTP.sys enables authenticated local attackers to gain SYSTEM-level access across a sweeping range of Windows client and server releases, from Windows 10 1607 through Windows 11 25H2 and Windows Server 2012 through 2025. An integer overflow in the kernel-mode HTTP driver triggers a heap-based buffer overflow (consistent with both the CWE-122 classification and the vendor-applied 'Heap Overflow' tag), allowing an attacker with an existing low-privilege local foothold to corrupt kernel heap structures and achieve full code execution as SYSTEM. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an existing authenticated local session with at minimum low-privilege user rights on the target Windows system, as confirmed by the CVSS vector metrics PR:L and AV:L. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.8 (High) score reflects the full C/I/A impact of achieving SYSTEM privilege but is appropriately tempered by the local attack vector (AV:L) and low-privilege prerequisite (PR:L) - an attacker must already possess an authenticated local session or local code execution capability before exploiting this flaw. … 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 released patches via Windows Update, WSUS, or Microsoft Update Catalog, targeting the fixed build versions confirmed by EUVD data: Windows Server 2025 and Windows 11 24H2 to build 10.0.26100.33296 (server) or 10.0.26100.9168 (client) or later; Windows Server 2022 to 10.0.20348.5499 or later; Windows Server 2019 and Windows 10 1809 to 10.0.17763.9115 or later; Windows Server 2016 and Windows 10 1607 to 10.0.14393.9418 or later; Windows 11 23H2 to 10.0.22631.7517 or later; Windows 11 25H2 to 10.0.26200.9168 or later; Windows 11 26H1 to 10.0.28000.2704 or later; Windows 10 22H2 to 10.0.19045.7663 or later; Windows 10 21H2 to 10.0.19044.7663 or later. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, audit and inventory all Windows systems (clients and servers 2012-2025) to establish current patch compliance baseline. …
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External POC / Exploit Code
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