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
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. There is no public exploit identified at time of analysis, and it is not listed in CISA KEV; a vendor patch is available from Microsoft.
Technical ContextAI
The flaw resides in the Windows Bluetooth Service, the OS component that manages Bluetooth device discovery, pairing, and data exchange and typically runs with elevated privileges. CWE-122 (heap-based buffer overflow) indicates the service writes attacker-influenced data beyond the bounds of a heap-allocated buffer, likely due to missing or incorrect length validation when parsing input from a local caller. The CPE data confirms the affected surface is the Microsoft Windows platform itself across supported client SKUs (Windows 10 Version 1809, 21H2, 22H2; Windows 11 24H2, 25H2, 26H1) and server SKUs (Windows Server 2019 including Server Core, Windows Server 2022, Windows Server 2025 including Server Core). Successful heap corruption in a high-privilege service is a classic path to arbitrary code execution in the service's security context.
RemediationAI
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. As a compensating control on systems that do not require Bluetooth (common on servers such as Windows Server 2019/2022/2025 and Server Core installations), disable and stop the Bluetooth Support Service and any Bluetooth radio, and remove or disable Bluetooth adapters via device management or Group Policy; the trade-off is loss of Bluetooth peripheral connectivity, which is negligible on most servers but disruptive on laptops relying on Bluetooth mice, keyboards, or headsets. Because exploitation requires an existing local low-privileged foothold, tightening local access - restricting interactive/RDP logon rights and enforcing least privilege - further reduces the realistic attack surface until the patch is deployed.
More in Windows Server 2019
View allWindows MSHTML component contains a remote code execution vulnerability that allows attackers to craft malicious ActiveX
<p>A remote code execution vulnerability exists when the Windows Print Spooler service improperly performs privileged fi
Windows MSDT (Microsoft Support Diagnostic Tool) allows remote code execution when called via the ms-msdt URL protocol f
Windows Win32k contains an out-of-bounds write vulnerability enabling local privilege escalation to SYSTEM, exploited by
Windows Print Spooler Remote Code Execution Vulnerability. Rated high severity (CVSS 7.8), this vulnerability is no auth
Windows Search Remote Code Execution Vulnerability. Rated high severity (CVSS 7.5), this vulnerability is remotely explo
Internet Shortcut Files Security Feature Bypass Vulnerability. Rated high severity (CVSS 8.1), this vulnerability is rem
Denial of service against HTTP/2 server implementations allows remote unauthenticated attackers to exhaust server resour
Windows Kernel contains a TOCTOU race condition vulnerability allowing local privilege escalation, exploited by the OilR
An elevation of privilege vulnerability exists in Windows when the Win32k component fails to properly handle objects in
Active Directory Domain Services Elevation of Privilege Vulnerability. Rated high severity (CVSS 7.5), this vulnerabilit
Windows Internet Shortcut Files (.url) contain an external control vulnerability (CVE-2025-33053, CVSS 8.8) that enables
Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Buffer Overflow
View allShare
External POC / Exploit Code
Leaving vuln.today