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9.8

CVE-2026-62878: Windows DNS Server Remote Code Execution

CVE-2026-62878 · published 23 days ago
Summary

An attacker can execute malicious code on your DNS server if they gain access to it. This is a serious concern because an attacker could then access and control your network. To protect yourself, ensure that your DNS server is properly secured and patched with the latest updates.

What to do
  • Update microsoft windows_10_1607 to version 10.0.14393.9418 or later.
  • Update microsoft windows_10_1809 to version 10.0.17763.9121 or later.
  • Update microsoft windows_server_2016 to version 10.0.14393.9418 or later.
  • Update microsoft windows_server_2019 to version 10.0.17763.9121 or later.
  • Update microsoft windows_server_2022 to version 10.0.20348.5440 or later.
  • Update microsoft windows_server_2025 to version 10.0.26100.33222 or later.
  • Update microsoft windows 10 version 1607 to version 10.0.14393.9418 or later.
  • Update microsoft windows server 2016 to version 10.0.14393.9418 or later.
  • Update microsoft windows server 2016 (server core installation) to version 10.0.14393.9418 or later.
  • Update microsoft windows server 2022 to version 10.0.20348.5499 or later.
  • Update microsoft windows server 2025 to version 10.0.26100.33296 or later.
  • Update microsoft windows server 2025 (server core installation) to version 10.0.26100.33296 or later.
Affected software
VendorProductAffected versions
microsoft windows_10_1607 < 10.0.14393.9418
cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x64:*
microsoft windows_10_1809 < 10.0.17763.9121
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:*
microsoft windows_server_2012 r2
cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*
microsoft windows_server_2016 < 10.0.14393.9418
cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*
microsoft windows_server_2019 < 10.0.17763.9121
cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*
microsoft windows_server_2022 < 10.0.20348.5440
cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*
microsoft windows_server_2025 < 10.0.26100.33222
cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*
microsoft windows 10 version 1607 < 10.0.14393.9418
microsoft windows 10 version 1809 < 10.0.17763.9115
< 10.0.17763.9121
microsoft windows server 2012 < 6.2.9200.26279
< 6.2.9200.26280
microsoft windows server 2012 (server core installation) < 6.2.9200.26279
< 6.2.9200.26280
microsoft windows server 2012 r2 < 6.3.9600.23337
< 6.3.9600.23338
microsoft windows server 2012 r2 (server core installation) < 6.3.9600.23337
< 6.3.9600.23338
microsoft windows server 2016 < 10.0.14393.9418
microsoft windows server 2016 (server core installation) < 10.0.14393.9418
microsoft windows server 2019 < 10.0.17763.9115
< 10.0.17763.9121
microsoft windows server 2019 (server core installation) < 10.0.17763.9115
< 10.0.17763.9121
microsoft windows server 2022 < 10.0.20348.5499
microsoft windows server 2025 < 10.0.26100.33296
microsoft windows server 2025 (server core installation) < 10.0.26100.33296
Original advisory text
Windows DNS Server Remote Code Execution Vulnerability
Stack-based buffer overflow in Windows DNS allows an unauthorized attacker to execute code over a network.
Severity
9.8 Critical
CVSS 3.1: 9.8 (MITRE)
Exploitation
EPSS 1%
Type
CWE-121Stack-based Buffer Overflow
Timeline
Published11 Aug 2026
Updated2 Sep 2026
First seen11 Aug 2026
Sources
CVE-2026-62878 · MITRE
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