EUVD-2026-56365
GHSA-3x6c-wqxm-2hxm
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Local vector and low-privilege requirement match 'authorized attacker' prerequisite; AC:H reflects inherent complexity of reliably exploiting a kernel-mode heap overflow; full C/I/A impact reflects achievable SYSTEM privileges.
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
Heap-based buffer overflow in Windows HTTP.sys enables a locally authenticated, low-privileged attacker to escalate privileges on the affected host, likely achieving SYSTEM-level control. The flaw spans a wide range of Windows versions from Server 2012 through Windows 11 26H1, representing substantial enterprise exposure despite requiring initial local access. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must hold a low-privileged, authenticated local account on the target system, as described by 'authorized attacker' in the CVE and confirmed by CVSS PR:L. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.0 score is appropriately calibrated: the AV:L and AC:H metrics substantially constrain real-world risk relative to the H/H/H impact. … 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 via Windows Update or WSUS targeting the fixed builds per affected version - for example, Windows Server 2025 to 10.0.26100.33296, Windows 11 24H2 to 10.0.26100.9168, Windows Server 2022 to 10.0.20348.5499, Windows Server 2019 to 10.0.17763.9115, Windows Server 2016 to 10.0.14393.9418, Windows 10 22H2 to 10.0.19045.7663, and Server 2012/2012R2 to 6.2.9200.26279 and 6.3.9600.23337 respectively. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Immediately (within 24 hours) identify and inventory all Windows Server 2012-2022 and Windows 11 systems; prioritize multi-user systems, business-critical servers, and infrastructure handling sensitive data for accelerated patching. …
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External POC / Exploit Code
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