Out-of-bounds read in Microsoft Windows and Windows Server - CVE-2026-27931
Published: April 14, 2026
Vulnerability identifier: #VU126048
CSH Severity: Medium
CVSS v4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-27931
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to gain access to potentially sensitive information.
The vulnerability exists due to a boundary condition in Windows GDI. A remote attacker can trick a victim to open or preview content that contains the malicious Enhanced Metafile (EMF), trigger an out-of-bounds read error and read contents of memory on the system.
Affected software
Microsoft Windows
Windows Server
Windows Server
How to mitigate CVE-2026-27931
Install updates from vendor's website.
Microsoft Windows - addressed in versions 10 21H2 10.0.19044.7184, 10 22H2 10.0.19045.7184, 11 23H2 10.0.22631.6936, 11 24H2 10.0.26100.32690, 11 25H2 10.0.26200.8246, 11 26H1 10.0.28000.1836
Windows Server - addressed in versions 2012 R2 6.3.9600.23132, 2022 23H2 10.0.25398.2274, 2022 10.0.20348.5020, 2025 10.0.26100.32690
Windows Server - addressed in versions 2012 R2 6.3.9600.23132, 2022 23H2 10.0.25398.2274, 2022 10.0.20348.5020, 2025 10.0.26100.32690