CVE-2026-105599: Microsoft Office PowerPoint heap-based buffer overflow

CVE-2026-105599 · Severity: high · CVSS 7.5 · Published 2026-10-13

Microsoft Office PowerPoint contains a heap-based buffer overflow vulnerability that allows an attacker to execute arbitrary code on a user's computer over the network. An attacker could exploit this by sending a malicious PowerPoint file, leading to complete system compromise and data theft. This poses a significant risk to organizations where PowerPoint is used for business-critical presentations and communications.

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

Quick answers

Is CVE-2026-105599 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-105599 being exploited in the wild.
How severe is CVE-2026-105599?
High severity, with a CVSS score of 7.5, published 13 October 2026.
Which products and versions are affected?
Microsoft Office PowerPoint.
Is there a fix for CVE-2026-105599?
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-2026-105599 attacked?
It is attacked over the network, in a web application.
Am I affected by CVE-2026-105599?
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

A heap-based buffer overflow vulnerability exists in Microsoft Office PowerPoint's file parsing logic. An attacker can trigger the overflow by crafting a malicious PowerPoint file and delivering it to a user; user interaction (opening the file) is required. Successful exploitation results in arbitrary code execution with the privileges of the user running PowerPoint.

Affected products

  • Microsoft Office PowerPoint

Timeline

  • 2026-10-13: disclosed

References

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