Heap-based buffer overflow in Microsoft Windows and Windows Server - CVE-2026-105551

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Main Vulnerability Database Vulnerabilities #VU164673

Heap-based buffer overflow in Microsoft Windows and Windows Server - CVE-2026-105551

Published: November 10, 2026


Vulnerability identifier: #VU164673
CSH Severity: Medium
CVSS v4: 7.1 [CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-105551
CWE-ID: CWE-122
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to escalate privileges to SYSTEM on the affected system.

The vulnerability exists due to a heap-based buffer overflow in Windows NetBIOS when an affected client application communicates with an attacker-controlled server. A remote attacker can convince a user to connect the affected client application to that server and trigger the buffer overflow to gain SYSTEM privileges.


Affected software

Microsoft Windows
Windows Server

How to mitigate CVE-2026-105551

Install security update from vendor's website.

Microsoft Windows - addressed in versions 10 21H2 10.0.19044.7846, 10 22H2 10.0.19045.7846, 10 1607 10.0.14393.9688, 10 1809 10.0.17763.9487, 11 23H2 10.0.22631.7711, 11 24H2 10.0.26100.9911, 11 24H2 10.0.26100.9974, 11 25H2 10.0.26200.9911, 11 25H2 10.0.26200.9974, 11 26H1 10.0.28000.3501
Windows Server - addressed in versions 2016 10.0.14393.9688, 2019 10.0.17763.9487, 2022 10.0.20348.5870, 2025 10.0.26100.33730, 2025 10.0.26100.33822

External References

Related Security Bulletins