Integer overflow in Windows Server - CVE-2026-26111
Published: March 10, 2026
Vulnerability identifier: #VU123688
CSH Severity: High
CVSS v4: 8.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-26111
CWE-ID: CWE-190
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to integer overflow in Windows Routing and Remote Access Service (RRAS). A remote attacker can trick a victim to send a request to a malicious server, trigger integer overflow and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
Affected software
Windows Server
How to mitigate CVE-2026-26111
Install updates from vendor's website.
Windows Server - addressed in versions 2012 R2 6.3.9600.23074, 2012 6.2.9200.25973, 2016 10.0.14393.8957, 2019 10.0.17763.8511, 2022 23H2 10.0.25398.2207, 2022 10.0.20348.4830, 2022 10.0.20348.4893, 2025 10.0.26100.32463, 2025 10.0.26100.32522