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CVE-2026-33115 is a Critical use-after-free vulnerability in Microsoft Office Word. The flaw arises from improper handling of object lifetime in Word, allowing memory to be reused after it has been freed. By causing Word to access the stale object state, an attacker can corrupt memory and achieve code execution. Microsoft and multiple advisories describe the issue as affecting Word and note that the Preview Pane can serve as an attack vector, meaning exploitation may occur when a crafted document is previewed rather than fully opened. Although some summaries describe the outcome as local code execution, the vulnerability is also characterized as a Word remote code execution issue because delivery can be initiated remotely through a malicious document while code runs on the victim system in the context of the local user.
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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.
8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A critical Microsoft Word remote code execution vulnerability affecting Office and Microsoft 365, with the Preview Pane identified as an attack vector.
A critical Microsoft Word remote code execution vulnerability caused by a use-after-free flaw.
A critical use-after-free vulnerability in Microsoft Office Word that can result in local code execution.
A critical remote code execution vulnerability in Microsoft Word.
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.