What is CVE-2026-69781?

CVE-2026-69781 is a medium-severity vulnerability in Microsoft Windows 11 Version 24h2, classified under Missing Release of Memory after Effective Lifetime. CVSS score: 6.5/10. Published 2026-09-08.

How severe is CVE-2026-69781?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Microsoft Windows 11 Version 24h2

CVE-2026-69781

Missing release of memory after effective lifetime in Windows DHCP Client allows an unauthorized attacker to deny service over an adjacent network.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Microsoft Windows 11 Version 24h2
Microsoft Windows 11 Version 25h2
Microsoft Windows 11 Version 26h1
Microsoft Windows Server 2025
Microsoft Windows Server 2025 (Server Core Installation)

Weakness classification (CWE)

CWE-401 — Missing Release of Memory after Effective Lifetime

References

secure@microsoft.com (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-69781?: CVE-2026-69781 is a medium-severity vulnerability in Microsoft Windows 11 Version 24h2, classified under Missing Release of Memory after Effective Lifetime. CVSS score: 6.5/10. Published 2026-09-08.
How severe is CVE-2026-69781?: Medium severity. CVSS v3 base score is 6.5 out of 10.