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CVE-2026-69276 is an integer-underflow (wraparound) vulnerability in the Microsoft UxTheme Library, uxtheme.dll. Improper handling of an arithmetic operation can cause an integer value to wrap, potentially resulting in unsafe subsequent memory or logic handling. An unauthorized attacker may exploit the flaw over a network to execute code on an affected Windows system.
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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.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
13 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Microsoft patch-night vulnerability; no vulnerability-specific technical details are provided.
An integer-underflow vulnerability in the Microsoft UxTheme Library (uxtheme.dll) that can allow unauthenticated remote code execution.
An integer-underflow vulnerability in the Microsoft UxTheme Library (uxtheme.dll) that may enable unauthenticated remote code execution. It is addressed by KB5122876 for Windows 10 version 1809 and Windows Server 2019.
An integer-underflow vulnerability in Microsoft's UxTheme Library (uxtheme.dll) that permits unauthorized remote code execution over a network.
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.