CVE-2026-49181

EUVD-2026-43798
Integer underflow (wrap or wraparound) in Windows DHCP Client allows an unauthorized attacker to elevate privileges over a network.
Wrap or Wraparound
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
7.5 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: 65.08%
Affected Products (NVD)
VendorProductVersion
microsoftwindows_10_1607
𝑥
< 10.0.14393.9339
microsoftwindows_10_1607
𝑥
< 10.0.14393.9339
microsoftwindows_10_1809
𝑥
< 10.0.17763.9020
microsoftwindows_10_1809
𝑥
< 10.0.17763.9020
microsoftwindows_server_2012
-
microsoftwindows_server_2016
𝑥
< 10.0.14393.9339
microsoftwindows_server_2019
𝑥
< 10.0.17763.9020
microsoftwindows_server_2022
𝑥
< 10.0.20348.5386
microsoftwindows_server_2025
𝑥
< 10.0.26100.33158
𝑥
= Vulnerable software versions
Windows Releases
Platform
Version
Windows 10
1607 (x64, x86)
KB5099535
1809 (x64, x86)
KB5099538
Windows Server 2012
Server Core
KB5099445
Standard
KB5099445
Windows Server 2012 R2
Server Core
KB5099444
Standard
KB5099444
Windows Server 2016
Server Core
KB5099535
Standard
KB5099535
Windows Server 2019
Server Core
KB5099538
Standard
KB5099538
Windows Server 2022
Standard
KB5099540
Windows Server 2025
Server Core
KB5099536
Standard
KB5099536
Common Weakness Enumeration
References
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-49181