CVE-2026-42975 is a Windows Bluetooth Port Driver heap-based buffer overflow that can lead to remote code execution on affected Windows systems. It has a CVSS v3.1 base score of 8.0 (High) and a temporal score of 7.0, with adjacent network attack vector, low attack complexity, no privileges required, and user interaction required. Microsoft says exploitation requires the target device to have Bluetooth enabled and be discoverable; this is not the default on Windows systems. There are no public disclosures or known exploitation reports, and exploit code maturity is unproven. Because the attack requires proximity within Bluetooth range, the real-world enterprise risk is highest for nearby attackers rather than remote internet exposure.

Highlights:
- CVSS scores: Base 8.0 - Temporal 7.0
- Exploit status & code maturity: Publicly Disclosed: No; Exploited: No; Exploit Code Maturity: UNPROVEN
- Impact: Remote Code Execution with HIGH confidentiality, integrity, and availability impacts
- Exploitation likelihood: Exploitation Less Likely; adjacent network vector requires attacker proximity within Bluetooth range and user interaction is required
- Severity for enterprise: High severity, but risk is constrained by the adjacent-network Bluetooth requirement and the need for Bluetooth discoverability to be enabled
- Patch status: available

Affected systems:
- Windows 10 1607
- Windows 10 1809
- Windows 10 21H2
- Windows 10 22H2
- Windows 11 24H2
- Windows 11 25H2
- Windows 11 26H1
- Windows 11 unspecified
- Windows Server 2012
- Windows Server 2012 R2
- Windows Server 2016
- Windows Server 2019
- Windows Server 2022
- Windows Server 2025