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Vulnerability record · CVE-2026-40378 · published 14 July 2026

CVE-2026-40378: Microsoft windows 10 1607 vulnerability

Microsoft · Windows 10 1607

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

7.5 CVSS 3.1 High EPSS 1.2% · top 33.8% CWE-789 · CWE-789
7.5CVSS 3.1 base score
1.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
13Affected product versions listed by NVD
1References
22 Jul 2026Last modified by NVD

Description

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

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

Affected products

13 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40378 Vendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2026-40378), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.