What is CVE-2026-40403?

CVE-2026-40403 is a security advisory published by Microsoft Security Response Center (MSRC) with Remote Code Execution severity. Windows Graphics Component Remote Code Execution Vulnerability

Which CVE IDs does CVE-2026-40403 cover?

CVE-2026-40403 covers the following CVE IDs: CVE-2026-40403. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-40403?

CVE-2026-40403 has a CVSS v3 base score of 8.8, published by Microsoft Security Response Center (MSRC).

CVE-2026-40403Remote Code ExecutionCVSS 8.8

Windows Graphics Component Remote Code Execution Vulnerability

Vendor

Microsoft Security Response Center (MSRC)

Published

May 22, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-40403 →

📋 Description

<p>Heap-based buffer overflow in Windows Win32K - GRFX allows an authorized attacker to execute code locally.</p>