CVE-2026-27931: Information Disclosure in Windows GDI

The core impact of CVE-2026-27931 lies in the potential for local information disclosure. An attacker who can trigger this vulnerability could read data beyond the intended boundaries of memory within the GDI component. While the vulnerability is described as local, this means an attacker needs some level of access to the system to exploit it. The specific data exposed is unknown, but it could include sensitive system information, user data, or potentially even parts of other applications' memory. The severity is classified as medium, suggesting a moderate risk of exploitation given the need for local access and the potential impact of data exposure.

1. 发布日期2026-04-14
2. 修改日期2026-05-12
3. EPSS 更新日期2026-04-22

The primary mitigation for CVE-2026-27931 is to upgrade affected Windows systems to version 10.0.28000.1836 or later, which includes the security patch. If immediate patching is not possible, consider implementing stricter access controls to limit the potential for local attackers to exploit the vulnerability. While there are no specific WAF or proxy rules that can directly address this vulnerability, ensuring that the GDI component is up-to-date is the most effective preventative measure. After upgrading, confirm the fix by verifying the Windows build version is 10.0.28000.1836 or higher using systeminfo command.