CVE-2026-40403HIGH 8.8EPSS p35.2%

CVE-2026-40403CVE-2026-40403

Description

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

Scoring

CVSS 3.18.8 (HIGH)
VectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
EPSS0.43% probability of exploitation · percentile 35.2% · 2026-08-03T12:00:16Z
Published2026-05-12
Last modified2026-05-15

Underlying weaknesses· 1

CWE-122

References

  1. https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40403

1

TypeTargetConfidenceTier
WeaknessHeap-based Buffer Overflowcwe-1220%live

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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.