CVE-2026-65791

EUVD-2026-56738
Heap-based buffer overflow in Windows iSCSI Target Service allows an unauthorized attacker to execute code over a network.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
9.8 CRITICAL
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: 60.43%
Affected Products (NVD)
VendorProductVersion
microsoftwindows_10_1607
𝑥
< 10.0.14393.9418
microsoftwindows_10_1809
𝑥
< 10.0.17763.9115
microsoftwindows_server_2012
-
microsoftwindows_server_2016
𝑥
< 10.0.14393.9418
microsoftwindows_server_2019
𝑥
< 10.0.17763.9115
microsoftwindows_server_2022
𝑥
< 10.0.20348.5440
microsoftwindows_server_2025
𝑥
< 10.0.26100.33222
𝑥
= Vulnerable software versions
Windows Releases
Platform
Version
Windows 10
1607 (x64, x86)
KB5120418
1809 (x64, x86)
KB5120238
Windows Server 2012
Server Core
KB5120386
Standard
KB5120386
Windows Server 2012 R2
Server Core
KB5120385
Standard
KB5120385
Windows Server 2016
Server Core
KB5120418
Standard
KB5120418
Windows Server 2019
Server Core
KB5120238
Standard
KB5120238
Windows Server 2022
Server Core
KB5120242
Standard
KB5120242
Windows Server 2025
Server Core
KB5120233
Standard
KB5120233
Common Weakness Enumeration
References
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-65791