CVE-2026-27931: Windows GDI Information Disclosure Vulnerability

Overview

Severity: Medium (CVSS 5.5)
CVSS Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C
Category: Information Disclosure
Exploit Status: Not Exploited
Exploitation Likelihood: Less Likely
Patch Tuesday: 2026-Apr
Released: 2026-04-14

Description

Out-of-bounds read in Windows GDI allows an unauthorized attacker to disclose information locally.

FAQ

What type of information could be disclosed by this vulnerability? This vulnerability may allow an attacker to access small portions of memory from the affected application when it processes a specially crafted Enhanced Metafile (EMF). This issue is an out‑of‑bounds read, any disclosure would be limited to whatever data happens to reside in adjacent memory at the time. According to the CVSS metric, user interaction is required (UI:R). What interaction would the user have to do? The user would have to open or preview content that contains the malicious Enhanced Metafile (EMF).

Affected Products (19)

Windows

Windows Server 2022
Windows Server 2022 (Server Core installation)
Windows 10 Version 21H2 for 32-bit Systems
Windows 10 Version 21H2 for ARM64-based Systems
Windows 10 Version 21H2 for x64-based Systems
Windows Server 2025 (Server Core installation)
Windows 11 Version 25H2 for ARM systems
Windows 11 Version 25H2 for x64-based Systems
Windows 11 Version 23H2 for ARM64-based Systems
Windows 11 Version 23H2 for x64-based Systems
Windows Server 2022, 23H2 Edition (Server Core installation)
Windows 11 Version 24H2 for ARM64-based Systems
Windows 11 Version 24H2 for x64-based Systems
Windows Server 2025
Windows 11 Version 26H1 for ARM64-based Systems
Windows 11 version 26H1 for x64-based Systems

ESU

Windows 10 Version 22H2 for x64-based Systems
Windows 10 Version 22H2 for ARM64-based Systems
Windows 10 Version 22H2 for 32-bit Systems

Security Updates (7)

Acknowledgments

xina1i@psbc

Revision History

2026-04-14: Information published.