EUVD-2026-44286
GHSA-x79c-xxf9-88vc
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local vector needing an existing low-privileged foothold (AV:L/PR:L), no user interaction, and heap corruption in a high-privilege service yielding full C/I/A impact.
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
2DescriptionCVE.org
Heap-based buffer overflow in Windows Bluetooth Service allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Windows Bluetooth Service affects a broad range of Microsoft Windows client and server editions (Windows 10 1809 through Windows 11 26H1, and Windows Server 2019 through 2025). A heap-based buffer overflow (CWE-122) lets an already-authenticated local attacker corrupt kernel/service memory to elevate from a low-privileged account to SYSTEM. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to already have authenticated local access to the Windows host with at least low privileges (CVSS PR:L), and the target must have the Windows Bluetooth Service present and running - the practical prerequisite is that the Bluetooth stack is enabled/reachable by a local caller, which is default on Windows client SKUs but frequently disabled or absent on servers. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H (base 7.8, High) describes a locally exploitable issue with low attack complexity, requiring low privileges and no user interaction, yielding full confidentiality, integrity, and availability impact within an unchanged scope - consistent with a low-to-SYSTEM elevation of privilege. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has already gained low-privileged code execution on a Windows host (for example through phishing or a compromised low-rights service account) invokes the local Bluetooth Service with crafted input that overflows a heap buffer, corrupting service memory to execute code as SYSTEM. Given AV:L/AC:L, no user interaction is needed and the technique is reliable once a foothold exists. … |
| Remediation | Patch available per vendor advisory: apply the Microsoft security update for CVE-2026-58538 published in the MSRC Update Guide at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58538, selecting the cumulative update matching each affected Windows client or server build. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows 10 (versions 1809 through 26H1), Windows 11, and Windows Server (2019 through 2025) systems to establish baseline exposure. …
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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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