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CVE-2026-70329 is a high-severity remote code execution vulnerability in Microsoft Office Outlook caused by an integer overflow or wraparound condition. The flaw can be triggered when Outlook processes a specially crafted malicious Office file. The integer handling error can lead to memory corruption and loss of control over program execution, enabling arbitrary code execution in the context of the affected application and user session. Affected product lines include Microsoft 365 Apps for Enterprise, Office 2019, Office LTSC 2021, Office LTSC 2024, and Outlook 2016.
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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.
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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.
9 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A high-severity remote code execution vulnerability in Microsoft Office Outlook caused by an integer overflow or wraparound weakness that can be triggered when a user opens a malicious Office file, potentially allowing arbitrary code execution.
A remote code execution vulnerability in Microsoft Outlook.
A remote code execution vulnerability in Microsoft Outlook.
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.