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CVE-2026-62870 is a high-severity use-after-free vulnerability in Microsoft Office Excel. The flaw is associated with improper memory handling during object disposal operations in Excel's parsing engine, where freed memory can be reused in a way that permits attacker-controlled execution flow. An unauthenticated attacker can exploit the issue by delivering a specially crafted Excel file to a target and inducing the target to open it. Successful exploitation results in remote code execution in the security context of the current user. Reported affected product lines include Microsoft 365 Apps for Enterprise, Excel 2016, Office 2019, Office LTSC 2021, and Office LTSC 2024 on 32-bit and x64-based systems.
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What an attacker gets, and what they’ve been doing with it.
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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.
8 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 Office Excel caused by a use-after-free flaw in the parsing engine when handling specially crafted Excel files.
A high-severity remote code execution vulnerability in Microsoft Office Excel caused by a use-after-free condition.
A use-after-free vulnerability in Microsoft Office Excel that could allow remote code execution over a network.
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.