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CVE-2026-33840 is a local elevation-of-privilege vulnerability in the Windows kernel-mode graphics subsystem, specifically the Win32K ICOMP compositor component. The flaw is a use-after-free condition in which a Win32K object can be freed prematurely and later dereferenced through a stale pointer. An attacker with local access and low privileges can exploit this memory corruption condition by reclaiming the freed memory with controlled data, causing attacker-influenced data to be processed in kernel mode. Successful exploitation can result in escalation from a standard user context to SYSTEM. Affected platforms include Windows 11 versions 24H2, 25H2, and 26H1, as well as Windows Server 2025.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
15 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An important Win32k elevation of privilege vulnerability that Microsoft determined is more likely to be exploited.
A Microsoft Windows Win32K use-after-free elevation of privilege vulnerability that allows a locally authorized attacker with low privileges to gain SYSTEM privileges.
A local privilege escalation vulnerability caused by a use-after-free flaw in the Windows Win32K ICOMP kernel-mode graphics subsystem that can allow a standard user 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.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.