Use-After-Free RCE in Microsoft Office Excel
CVE-2025-59236 is a remote code execution vulnerability in Microsoft Office Excel caused by a use-after-free condition. The provided content states that exploitation can be triggered by opening a malicious file, after which Excel may access memory that has already been freed, leading to memory corruption and attacker-controlled code execution in the context of the user running Excel. The issue is described as affecting Microsoft Office Excel specifically and is part of Microsoft’s October 2025 Patch Tuesday updates.
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Affected products & vendors
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.
Recent activity
2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Microsoft Office remote code execution vulnerability triggered by opening a malicious file.
A use-after-free vulnerability in Microsoft Excel allowing local code execution by an unauthorized attacker.
The version that knows your environment.
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.