Main Vulnerability Database Vulnerabilities #VU147948

Memory leak in Microsoft Windows and Windows Server - CVE-2026-69781

Published: September 8, 2026

Vulnerability identifier: #VU147948

CSH Severity: Medium

CVSS v4: 7.1 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-69781

CWE-ID: CWE-401

Exploitation vector: Adjecent network

Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to missing release of memory after effective lifetime in Windows DHCP Client when handling DHCP traffic over an adjacent network. A remote attacker can send crafted DHCP traffic to cause a denial of service.

Affected software

Microsoft Windows
Windows Server

How to mitigate CVE-2026-69781

Install security update from vendor's website.

Microsoft Windows - addressed in versions 11 24H2 10.0.26100.9445, 11 25H2 10.0.26200.9445, 11 26H1 10.0.28000.2954
Windows Server - update to 2025 10.0.26100.33438

External References

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2026-69781

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