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CVE-2026-40403

🗓️ 13 May 2026 20:22:41Reported by redhat.comType 
redhatcve
 redhatcve
🔗 access.redhat.com👁 3 Views

CVE-2026-40403: Heap-based overflow in Windows Win32K GRFX allows local code execution.

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Refs
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ATTACKERKB
CVE-2026-40403
12 May 202616:59
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CVE-2026-40403
12 May 202615:52
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Microsoft Win32k 安全漏洞
12 May 202600:00
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12 May 202618:30
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Microsoft KB
May 12, 2026—KB5087420 (OS Build 22631.7079)
12 May 202614:00
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Microsoft KB
May 12, 2026—Hotpatch KB5087423 (OS Build 26100.32772)
12 May 202614:00
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Microsoft KB
May 12, 2026—Hotpatch KB5087424 (OS Build 20348.5074)
12 May 202614:00
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Microsoft KB
May 12, 2026—KB5087470 (Monthly Rollup)
12 May 202614:00
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13 May 2026 20:22Current
6.1Medium risk
Vulners AI Score6.1
CVSS 3.18.8
EPSS0.00017
SSVC
3