# CVE-2026-112729: Microsoft Office Word heap-based buffer overflow

Source: https://junglewise.ai/threats/cve-2026-112729-heap-based-buffer-overflow-in-microsoft-office-word-allows-an  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-10. Updated: 2026-11-10  
License: CC BY 4.0 with a link back

CVE-2026-112729 · Severity: high · CVSS 8.8 · Published 2026-11-10

Microsoft Office Word 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 to gain control of the system, steal sensitive documents, or deploy malware without requiring any special user privileges or interaction beyond opening a malicious document.

Technologies: [Microsoft Office Word](https://junglewise.ai/threats/technologies/office-word). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2026-112729 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-112729 being exploited in the wild.

**How severe is CVE-2026-112729?** High severity, with a CVSS score of 8.8, published 10 November 2026.

**Which products and versions are affected?** Microsoft Office Word.

**Is there a fix for CVE-2026-112729?** 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-2026-112729 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-112729?** Check whether you run Microsoft Office Word. 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 Word's document parsing allows remote code execution when processing a specially crafted Office document. The vulnerability is triggered via network delivery of a malicious document and does not require authentication or user interaction beyond opening the file. An attacker gains arbitrary code execution in the context of the Word application.

## Affected products

- Microsoft Office Word

## Timeline

- 2026-11-10: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-112729](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-112729)

## 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)