Out-of-bounds read in Windows Server - CVE-2026-83635
Published: October 14, 2026
Vulnerability identifier: #VU154780
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-83635
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to an out-of-bounds read in DNS Server when handling network traffic. A remote attacker can trigger the out-of-bounds read over the network to cause a denial of service.
Affected software
Windows Server
How to mitigate CVE-2026-83635
Install security update from vendor's website.
Windows Server - addressed in versions 2012 R2 6.3.9600.23470, 2012 6.2.9200.26434, 2016 10.0.14393.9612, 2019 10.0.17763.9376, 2022 10.0.20348.5761, 2025 10.0.26100.33650