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CVE-2026-55018 is a use-after-free vulnerability in Microsoft Office that allows local code execution. The flaw is associated with improper handling of object lifetime in memory, creating a condition where freed memory can be reused in a way that enables attacker-controlled behavior. Available reporting indicates this class of Microsoft Office vulnerabilities is typically triggered when a user opens a specially crafted document, after which memory corruption can lead to execution of arbitrary code in the context of the affected Office application.
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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.
1 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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.