Buffer over-read in Microsoft Windows and Windows Server - CVE-2026-68819

Vulnerability identifier: #VU141834

CSH Severity: Medium

CVSS v4: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-68819

CWE-ID: CWE-126

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to buffer over-read in Windows Network File System when handling network requests. A remote attacker can send a specially crafted request to cause a denial of service.

Microsoft Windows
Windows Server

Install security update from vendor's website.

Microsoft Windows - addressed in versions 10 1607 10.0.14393.9418, 10 1809 10.0.17763.9115
Windows Server - addressed in versions 2012 R2 6.3.9600.23337, 2012 6.2.9200.26279, 2016 10.0.14393.9418, 2019 10.0.17763.9115, 2022 10.0.20348.5440, 2022 10.0.20348.5499, 2025 10.0.26100.33222, 2025 10.0.26100.33296

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2026-68819

• Multiple vulnerabilities in Microsoft Windows