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 10 Version 1809
View allRemote code execution in Windows IKE Extension (Internet Key Exchange) via double free memory corruption allows unauthen
Local privilege escalation in Microsoft Active Directory Federation Services (AD FS) lets an already-authenticated low-p
Windows Shell protection mechanism failure (CVE-2026-32202) allows remote attackers to perform spoofing attacks over a n
Local privilege escalation in the Microsoft Windows Kernel allows an unauthorized attacker to gain elevated (SYSTEM-leve
Local privilege escalation in the Windows Kernel lets an already-authenticated attacker corrupt kernel memory via a use-
Local code execution in the Windows DHCP Client service stems from a use-after-free (CWE-416) memory-corruption flaw aff
Remote code execution in the Microsoft Windows DHCP Server role allows an unauthenticated network attacker to run arbitr
Local code execution in the Windows Media component of supported Windows 10, Windows 11, and Windows Server (2016 throug
Local privilege escalation via heap-based buffer overflow in the Windows Message Queuing (MSMQ) Queue Manager component
Local privilege escalation in Microsoft Windows Win32K lets an authenticated low-privileged user corrupt kernel heap mem
Local privilege escalation in the Windows NTFS file system driver lets an authenticated low-privileged user win a race c
Elevation of privilege in the Windows Hyper-V virtual network switch (VMSwitch) lets an authenticated attacker operating
Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Heap Overflow
View allShare
External POC / Exploit Code
Leaving vuln.today