Main Vulnerability Database Vulnerabilities #VU164731

Heap-based buffer overflow in Microsoft Windows and Windows Server - CVE-2026-109459

Published: November 10, 2026

Vulnerability identifier: #VU164731

CSH Severity: High

CVSS v4: 9.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-109459

CWE-ID: CWE-122

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a heap-based buffer overflow in Windows Message Queuing Queue Manager when processing network packets. A remote attacker can send a specially crafted packet to the affected service to execute arbitrary code on the target system.

Successful exploitation relies on complex memory shaping techniques.

Affected software

Microsoft Windows
Windows Server

How to mitigate CVE-2026-109459

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