EUVD-2026-56366
GHSA-jhr5-7989-3r59
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local kernel driver exploit via authenticated low-privilege account; no UI needed; full SYSTEM-level C/I/A impact; scope unchanged to single host.
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
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 (a kernel-mode HTTP listener driver) allows a locally authenticated low-privilege attacker to gain SYSTEM-level access across a broad range of Windows client and server releases. The CVSS vector (AV:L/AC:L/PR:L/UI:N) confirms exploitation requires only local authenticated access with no user interaction and low attack complexity, making this a practical post-compromise escalation primitive. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authenticated local user session - the CVSS vector PR:L confirms a low-privileged account suffices, and AV:L confirms the attacker must have local access (physical, RDP, SSH, or equivalent session). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.8 High score is well-supported by the vector: AV:L (local access required) contains the blast radius, but AC:L/PR:L/UI:N means any low-privilege local account can reliably trigger exploitation without assistance or complex preconditions. … 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-released security update immediately for each affected platform. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all Windows systems running HTTP.sys and confirm affected versions through Microsoft's security advisory. …
Sign in for detailed remediation steps and compensating controls.
Threat intelligence, references, and detailed analysis are available after sign-in.
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External POC / Exploit Code
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