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CVE-2026-34330 is a local elevation-of-privilege vulnerability in the Windows Win32K GRFX component within the Win32k graphics subsystem. The flaw is described as an integer overflow or wraparound that can result in an undersized memory allocation and subsequent memory corruption, including a use-after-free condition. By manipulating the affected code path and associated heap state, an authenticated local attacker with low privileges may be able to corrupt kernel memory or redirect execution in kernel context, ultimately obtaining SYSTEM privileges. The issue affects a broad range of supported Windows client and server releases and was addressed by Microsoft in the May 2026 security updates.
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What an attacker gets, and what they’ve been doing with it.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Microsoft Windows Win32K - GRFX local elevation of privilege vulnerability caused by integer overflow or wraparound and use-after-free conditions. Successful exploitation could allow an authorized attacker to gain SYSTEM privileges.
A Windows Win32K GRFX local privilege escalation vulnerability caused by an integer overflow that can lead to a use-after-free condition, allowing an authenticated local attacker to gain SYSTEM privileges.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.