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CVE-2026-40378

⚠️ high
🔍 Scan for this CVE
Summary

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 Score
7.5
High
EPSS Score
0.8
Exploit Probability
Published Date
2026-07-14
First Seen: 2026-07-15
📊 Relative Risk Intelligence

This CVE is Moderate Risk - more severe than 68.5% of all 340,405 vulnerabilities in our database.

#107,108
Above average severity
Severity Percentile
🎯 CISA SSVC Assessment Updated: Jul 14, 2026
🔍 Exploitation Status
None
No known exploits
⚙️ Automatable
YES
Can be exploited automatically
💥 Technical Impact
Partial
Limited system impact
SSVC data provided by CISA
Last Modified 2026-07-22
Source NVD 🔗
CVSS Vector 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE IDs (Weakness Types)
CWE-789

📦 Affected Products 14

Vendor Product Status Affected Versions
microsoft windows_server_2012 Affected
v-
microsoft windows_server_2012 Affected
vr2
microsoft windows_server_2016 Affected
< 10.0.14393.9339
microsoft windows_server_2019 Affected
< 10.0.17763.9020
microsoft windows_server_2022 Affected
< 10.0.20348.5386
microsoft windows_10_1809 Affected
< 10.0.17763.9020
microsoft windows_10_21h2 Affected
< 10.0.19044.7548
microsoft windows_10_22h2 Affected
< 10.0.19045.7548
microsoft windows_10_1607 Affected
< 10.0.14393.9339
microsoft windows_11_23h2 Affected
< 10.0.22631.7376
microsoft windows_11_24h2 Affected
< 10.0.26100.8875
microsoft windows_server_2025 Affected
< 10.0.26100.33158
microsoft windows_11_25h2 Affected
< 10.0.26200.8875
microsoft windows_11_26h1 Affected
< 10.0.28000.2269

🔗 References 1

https://msrc.microsoft.com/update-guide/vulnerabilit...
Vendor Advisory

🔗 Related CVEs 6

CVE ID Severity CVSS EPSS Summary Published
CVE-2026-58598 ⚠️ high 7.0 0.2 Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Backup Engine all... 2026-07-16
CVE-2026-33842 🔶 medium 5.5 0.4 Exposure of sensitive information to an unauthorized actor in Windows File Explorer allows an authorized attacker to dis... 2026-07-14
CVE-2026-34346 🔶 medium 5.5 0.2 Cleartext transmission of sensitive information in Windows Ancillary Function Driver for WinSock allows an authorized at... 2026-07-14
CVE-2026-40400 ⚠️ high 8.0 0.7 Relative path traversal in Windows PowerShell allows an authorized attacker to execute code over a network. 2026-07-14
CVE-2026-42975 ⚠️ high 8.0 0.3 Heap-based buffer overflow in Windows Bluetooth Port Driver allows an unauthorized attacker to execute code over an adja... 2026-07-14
CVE-2026-42990 ⛔ critical 9.8 0.7 Heap-based buffer overflow in SQL Server ODBC driver allows an unauthorized attacker to execute code over a network. 2026-07-14
These CVEs affect the same products