CVE-2026-78523

EUVD-2026-73321
Use after free in Windows DNS allows an unauthorized attacker to deny service over a network.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
5.9 MEDIUM
NETWORK
HIGH
NONE
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: 61.98%
Affected Products (NVD)
VendorProductVersion
microsoftwindows_10_1607
𝑥
< 10.0.14393.9512
microsoftwindows_10_1809
𝑥
< 10.0.17763.9245
microsoftwindows_server_2012
-
microsoftwindows_server_2016
𝑥
< 10.0.14393.9512
microsoftwindows_server_2019
𝑥
< 10.0.17763.9245
microsoftwindows_server_2022
𝑥
< 10.0.20348.5622
microsoftwindows_server_2025
𝑥
< 10.0.26100.33438
𝑥
= Vulnerable software versions
Windows Releases
Platform
Version
Windows 10
1607 (x64, x86)
KB5123099
1809 (x64, x86)
KB5122876
Windows Server 2012
Server Core
KB5123065
Standard
KB5123065
Windows Server 2012 R2
Server Core
KB5123066
Standard
KB5123066
Windows Server 2016
Server Core
KB5123099
Standard
KB5123099
Windows Server 2019
Server Core
KB5122876
Standard
KB5122876
Windows Server 2022
Server Core
KB5122882
Standard
KB5122882
Windows Server 2025
Server Core
KB5122871
Standard
KB5122871
Common Weakness Enumeration
References
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-78523