PT-2026-58119 · Microsoft · Lsass+1

CVE-2026-40378 · Published 2026-07-14 · Updated 2026-07-22

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions Windows Local Security Authority Subsystem Service (LSASS) (affected versions not specified)

Description An issue in the Windows Local Security Authority Subsystem Service (LSASS) occurs when memory allocation is performed with an excessive size value. This allows an unauthorized attacker to cause a denial of service over a network, affecting the stability of the system.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

DoS

Weakness Enumeration

CWE-789

Related Identifiers

CVE-2026-40378

Affected Products

Lsass

Windows

References · 5

• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-40378 · Security Note
• https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2026-40378 · Vendor Advisory
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40378 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-40378 · Security Note
• https://t.me/cveNotify/212096 · Telegram Post