Main Vulnerability Database Vulnerabilities #VU165066

Double free in Microsoft Windows and Windows Server - CVE-2026-118220

Published: November 11, 2026

Vulnerability identifier: #VU165066

CSH Severity: Low

CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-118220

CWE-ID: CWE-415

Exploitation vector: Local access

Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local user to escalate privileges and execute code in the security context of the NT AUTHORITYNetwork Service account.

The vulnerability exists due to double free in Windows Multiple Provider Router when releasing allocated memory. A local user can trigger repeated freeing of the same memory allocation to escalate privileges and execute code in the security context of the NT AUTHORITYNetwork Service account.

Affected software

Microsoft Windows
Windows Server

How to mitigate CVE-2026-118220

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