CVE-2026-40378 HIGH

CVE-2026-40378: Windows Local Security Authority Subsystem Service (LSASS) Denial of Service Vulnerability

Vendor Microsoft
Product Windows 10 Version 1607
Weakness CWE-789
Published July 14, 2026
Last update July 24, 2026
View on NVD All CVEs

CVSS base score

7.5/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality None
Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C

What the vulnerability does

01Description

Memory allocation with excessive size value in Windows Local Security Authority Subsystem Service (LSASS) allows an unauthorized attacker to deny service over a network.

Key dates

02Disclosure timeline

July 14, 2026 CVE published
July 24, 2026 Record updated