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

Source: https://junglewise.ai/threats/cve-2026-105599-heap-based-buffer-overflow-in-microsoft-office-powerpoint-allows  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-13. Updated: 2026-10-16  
License: CC BY 4.0 with a link back

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](https://junglewise.ai/threats/technologies/365-apps), [Microsoft 365](https://junglewise.ai/threats/technologies/microsoft-365), [Microsoft Office 2021](https://junglewise.ai/threats/technologies/office-2021), [Microsoft Office 2024](https://junglewise.ai/threats/technologies/office-2024), [Microsoft Office PowerPoint](https://junglewise.ai/threats/technologies/office-powerpoint). Vendors: [Microsoft](https://junglewise.ai/threats/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

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-105599](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-105599)

## Related threats

- [Microsoft Office PowerPoint heap-based buffer overflow](https://junglewise.ai/threats/cve-2026-120005-heap-based-buffer-overflow-in-microsoft-office-powerpoint-allows)
- [Microsoft Office PowerPoint heap-based buffer overflow](https://junglewise.ai/threats/cve-2026-120001-heap-based-buffer-overflow-in-microsoft-office-powerpoint-allows)
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- [Microsoft Office PowerPoint use-after-free code execution](https://junglewise.ai/threats/cve-2026-112734-use-after-free-in-microsoft-office-powerpoint-allows-an)