CVE-2026-105715: Microsoft Office Word integer overflow in network code execution

CVE-2026-105715 · Severity: high · CVSS 7.5 · Published 2026-10-13

Microsoft Office Word contains an integer overflow vulnerability that allows an attacker to execute arbitrary code on a victim's computer over a network. An attacker can exploit this by sending a specially crafted document, leading to complete system compromise including data theft or malware installation.

Technologies: Microsoft 365 Apps, Microsoft 365, Microsoft Office 2021, Microsoft Office 2024, Microsoft Office Word. Vendors: Microsoft.

Quick answers

Is CVE-2026-105715 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-105715 being exploited in the wild.
How severe is CVE-2026-105715?
High severity, with a CVSS score of 7.5, published 13 October 2026.
Which products and versions are affected?
Microsoft Office Word.
Is there a fix for CVE-2026-105715?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-105715 attacked?
It is attacked over the network.
Am I affected by CVE-2026-105715?
Check whether you run Microsoft 365 Apps, Microsoft 365, Microsoft Office 2021 or one of the others listed. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

An integer overflow or wraparound vulnerability in Microsoft Office Word's network-facing code allows remote code execution without authentication. The vulnerability can be triggered by processing a maliciously crafted document sent over the network, resulting in memory corruption and arbitrary code execution with the privileges of the affected user.

Affected products

  • Microsoft Office Word

Timeline

  • 2026-10-13: disclosed

References

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