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CVE-2026-55120 is a heap-based buffer overflow vulnerability in Microsoft Office PowerPoint. The flaw is triggered when PowerPoint processes a specially crafted Office document, causing memory corruption in heap-allocated data structures. Successful exploitation can allow an unauthorized attacker to execute arbitrary code locally in the security context of the user who opens the malicious file. The vulnerability is associated with malicious document handling in PowerPoint and requires user interaction to open the crafted file; the Preview Pane is not an attack vector.
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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.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.