CVE-2026-83739
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Use After Free in Windows Bluetooth Service

Publication date: 2026-10-13

Last updated on: 2026-10-16

Assigner: Microsoft Corporation

Description
Use after free in Windows Bluetooth Service allows an unauthorized attacker to execute code over an adjacent network.

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Meta Information

Published
2026-10-13
Last Modified
2026-10-16
Generated
2026-10-19
AI Q&A
2026-10-14
EPSS Evaluated
2026-10-18
NVD
CVE-2026-83739
EUVD
EUVD-2026-99971

Affected Vendors & Products

Showing 14 associated CPEs
Vendor Product Version / Range
Microsoft Windows 10 Version 1809 10.0.17763.0
Microsoft Windows 10 Version 21H2 10.0.19044.0
Microsoft Windows 10 Version 22H2 10.0.19045.0
Microsoft Windows 11 version 23H2 10.0.22631.0
Microsoft Windows 11 Version 23H2 10.0.22631.0
Microsoft Windows 11 Version 24H2 10.0.26100.0
Microsoft Windows 11 Version 25H2 10.0.26200.0
Microsoft Windows 11 version 26H1 10.0.28000.0
Microsoft Windows 11 Version 26H2 10.0.26300.0
Microsoft Windows Server 2019 10.0.17763.0
Microsoft Windows Server 2019 (Server Core installation) 10.0.17763.0
Microsoft Windows Server 2022 10.0.20348.0
Microsoft Windows Server 2025 10.0.26100.0
Microsoft Windows Server 2025 (Server Core installation) 10.0.26100.0

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-416 The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

Attack-Flow Graph

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Executive Summary

This vulnerability is a use-after-free issue in the Windows Bluetooth Service. It allows an unauthorized attacker to execute arbitrary code over an adjacent network. Use-after-free occurs when a program continues to use a pointer after freeing the memory it points to, potentially leading to memory corruption and code execution.

Impact Analysis

An attacker within adjacent network range could exploit this to run malicious code on your system. This may allow them to install programs, view or delete data, or create new accounts with full user rights. Systems with Bluetooth enabled and vulnerable Windows versions are at risk.

Mitigation Strategies

Apply the latest Windows security updates from Microsoft to patch the Bluetooth Service vulnerability. Disable Bluetooth if not in use and restrict network access to Bluetooth services until patched.

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