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

Source: https://junglewise.ai/threats/cve-2026-105715-integer-overflow-or-wraparound-in-microsoft-office-word-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-2026-105715 · 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](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 Word](https://junglewise.ai/threats/technologies/office-word). Vendors: [Microsoft](https://junglewise.ai/threats/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

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-105715](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-105715)

## Related threats

- [Microsoft Office Word buffer over-read information disclosure](https://junglewise.ai/threats/cve-2026-124233-buffer-over-read-in-microsoft-office-word-allows-an-unauthorized)
- [Microsoft Office Word use of uninitialized resource](https://junglewise.ai/threats/cve-2026-124185-use-of-uninitialized-resource-in-microsoft-office-word-allows-an)
- [Microsoft Office Word heap-based buffer overflow](https://junglewise.ai/threats/cve-2026-123394-heap-based-buffer-overflow-in-microsoft-office-word-allows-an)
- [Microsoft Office Word heap buffer overflow](https://junglewise.ai/threats/cve-2026-116925-heap-based-buffer-overflow-in-microsoft-office-word-allows-an)
- [Microsoft Office Word heap-based buffer overflow](https://junglewise.ai/threats/cve-2026-116923-heap-based-buffer-overflow-in-microsoft-office-word-allows-an)