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CVE-2026-45458 is a Critical use-after-free vulnerability in the Microsoft Office document-processing and Word rendering functionality used by Microsoft Word and Outlook Classic. A crafted document or email body can cause the rendering engine to dereference a dangling pointer after freed memory has been reallocated with attacker-controlled data. Because Outlook Classic uses Word functionality to render email content, malicious content can be processed through the Outlook Preview Pane as well as by Word. Successful exploitation results in arbitrary code execution in the context of the logged-on user.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
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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.
11 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A critical remote code execution vulnerability in Microsoft Outlook and Word that can be triggered by specially crafted documents or email content.
A critical remote code execution vulnerability caused by a use-after-free flaw in the Microsoft Word rendering engine, affecting Outlook and Word via email/document rendering, including the Outlook Preview Pane.
A critical remote code execution vulnerability in Microsoft Outlook and Word caused by a use-after-free flaw in the Word rendering engine/document parsing pipeline.
Critical Outlook and Word remote code execution vulnerability with a working Preview Pane attack vector, making it high priority for patching.
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.