CVE-2026-40403
Windows Graphics Component Remote Code Execution Vulnerability
HIGH
8.8
CVSS Score
Published: May 12, 2026 at 04:59 PM UTC
Updated: August 10, 2026 at 03:39 PM UTC
15 products affected across 1 vendorWindows Server 2016Windows Server 2019Windows Server 2012
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Severity
HIGH8.8
Exploit prediction
EPSS 0.4%
SSVC
No known exploit
Description
Heap-based buffer overflow in Windows Win32K - GRFX allows an authorized attacker to execute code locally.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
Affected range stops below 10.0.14393.9140, so it looks safe — our inference, not a vendor statement
Affected range stops below 10.0.17763.8755, so it looks safe — our inference, not a vendor statement
Affected range stops below 10.0.19044.7291, so it looks safe — our inference, not a vendor statement
Affected range stops below 10.0.19045.7417, so it looks safe — our inference, not a vendor statement
Affected range stops below 10.0.22631.7079, so it looks safe — our inference, not a vendor statement
Affected range stops below 10.0.22631.7219, so it looks safe — our inference, not a vendor statement
Affected range stops below 10.0.26100.8457, so it looks safe — our inference, not a vendor statement
Affected range stops below 10.0.26200.8457, so it looks safe — our inference, not a vendor statement
Affected range stops below 10.0.28000.2113, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.2.9200.26079, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.3.9600.23181, so it looks safe — our inference, not a vendor statement
Affected range stops below 10.0.14393.9140, so it looks safe — our inference, not a vendor statement
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
Patch and advisory references
References (1)
Vendor AdvisoryPatch
Source: cverecord
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40403SSVC — Action Prioritization
SSVCNo known exploitNot automatableTotal impact
SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.
CVSS
8.8HIGHmicrosoft
Vector?
Quick Info
StatusANALYZED
CWE
CWE-122
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