CVE-2026-116717: Microsoft Office heap-based buffer overflow

CVE-2026-116717 · Severity: high · CVSS 8.8 · Published 2026-11-10

Microsoft Office contains a heap-based buffer overflow vulnerability that allows an attacker on the network to execute malicious code on an affected system. An attacker could exploit this to gain full control of a user's computer, access sensitive documents, or launch further attacks within an organization.

Technologies: Microsoft Office. Vendors: Microsoft.

Quick answers

Is CVE-2026-116717 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-116717 being exploited in the wild.
How severe is CVE-2026-116717?
High severity, with a CVSS score of 8.8, published 10 November 2026.
Which products and versions are affected?
Microsoft Office.
Is there a fix for CVE-2026-116717?
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-2026-116717 attacked?
It is attacked over the network, in a web application.
Am I affected by CVE-2026-116717?
Check whether you run Microsoft Office. 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

A heap-based buffer overflow in Microsoft Office enables remote code execution over the network without requiring prior authentication. The vulnerability allows an attacker to overwrite heap memory and execute arbitrary code with the privileges of the user running Office, potentially leading to full system compromise.

Affected products

  • Microsoft Office

Timeline

  • 2026-11-10: disclosed

References

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