CVE-2026-50426: Windows DNS Server Remote Code Execution Vulnerability

Severity: medium (CVSS 6.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-14 · updated 2026-10-28
Weakness: CWE-23

Description

Relative path traversal in DNS Server allows an authorized attacker to execute code over an adjacent network.

Affected products

Microsoft Windows 10 1607: before 10.0.14393.9339 — fixed in 10.0.14393.9339
Microsoft Windows 10: before 10.0.17763.9020 — fixed in 10.0.17763.9020
Microsoft Windows Server 2012: r2
Microsoft Windows Server 2016: before 10.0.14393.9339 — fixed in 10.0.14393.9339
Microsoft Windows Server 2019: before 10.0.17763.9020 — fixed in 10.0.17763.9020
Microsoft Windows Server 2022: before 10.0.20348.5386 — fixed in 10.0.20348.5386
Microsoft Windows Server 2025: before 10.0.26100.33158 — fixed in 10.0.26100.33158
Microsoft Windows 10 1607: from 10.0.14393.0 before 10.0.14393.9339 — fixed in 10.0.14393.9339
Microsoft Windows 10: from 10.0.17763.0 before 10.0.17763.9020 — fixed in 10.0.17763.9020
Microsoft Windows Server 2012: from 6.2.9200.0 before 6.2.9200.26226 — fixed in 6.2.9200.26226
Microsoft Windows Server 2012 R2: from 6.3.9600.0 before 6.3.9600.23291 — fixed in 6.3.9600.23291
Microsoft Windows Server 2016: from 10.0.14393.0 before 10.0.14393.9339 — fixed in 10.0.14393.9339
Microsoft Windows Server 2019: from 10.0.17763.0 before 10.0.17763.9020 — fixed in 10.0.17763.9020
Microsoft Windows Server 2022: from 10.0.20348.0 before 10.0.20348.5386 — fixed in 10.0.20348.5386
Microsoft Windows Server 2025: from 10.0.26100.0 before 10.0.26100.33158 — fixed in 10.0.26100.33158

How to fix

Upgrade to a fixed version: Microsoft Windows 10 1607 10.0.14393.9339; Microsoft Windows 10 10.0.17763.9020; Microsoft Windows Server 2016 10.0.14393.9339; Microsoft Windows Server 2019 10.0.17763.9020; Microsoft Windows Server 2022 10.0.20348.5386; Microsoft Windows Server 2025 10.0.26100.33158; Microsoft Windows 10 1607 10.0.14393.9339; Microsoft Windows 10 10.0.17763.9020; Microsoft Windows Server 2012 6.2.9200.26226; Microsoft Windows Server 2012 R2 6.3.9600.23291; Microsoft Windows Server 2016 10.0.14393.9339; Microsoft Windows Server 2019 10.0.17763.9020. Check the vendor advisory for mitigations.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50426

Get alerted when CVE-2026-50426 or the next vulnerability affects your stack