CVE-2026-62878

Windows DNS Server Remote Code Execution Vulnerability

CVE-2026-62878 is fixed in 12 products on 1 platform, first by KB5120418, released August 11, 2026. It is not reported as exploited. Patch Radar priority: Urgent.

Urgent

CVSS

9.8

Critical

Exploitation

None reported

Exploitation Less Likely

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0097

62nd percentile

<p>Stack-based buffer overflow in Windows DNS allows an unauthorized attacker to execute code over a network.</p>

Where it's fixed

Product	Fixed in	Fix	Released
Microsoft
Windows Server 2012		KB5120386	Aug 11, 2026
Windows Server 2012 (Server Core installation)		KB5120386	Aug 11, 2026
Windows Server 2012 R2		KB5120385	Aug 11, 2026
Windows Server 2012 R2 (Server Core installation)		KB5120385	Aug 11, 2026
Windows Server 2016	14393.9418	KB5120418	Aug 11, 2026
Windows Server 2016 (Server Core installation)	14393.9418	KB5120418	Aug 11, 2026
Windows Server 2019	17763.9121	KB5120238	Aug 11, 2026
Windows Server 2019 (Server Core installation)	17763.9121	KB5120238	Aug 11, 2026
Windows Server 2022	20348.5440	KB5120229	Aug 11, 2026
Windows Server 2022	20348.5499	KB5120242	Aug 11, 2026
Windows Server 2022 (Server Core installation)	20348.5440	KB5120229	Aug 11, 2026
Windows Server 2022 (Server Core installation)	20348.5499	KB5120242	Aug 11, 2026
Windows Server 2025	26100.33222	KB5120228	Aug 11, 2026
Windows Server 2025	26100.33296	KB5120233	Aug 11, 2026
Windows Server 2025 (Server Core installation)	26100.33222	KB5120228	Aug 11, 2026
Windows Server 2025 (Server Core installation)	26100.33296	KB5120233	Aug 11, 2026

Details

Published
August 11, 2026
Weakness
Stack-based Buffer Overflow
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62878

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