# CVE-2026-116719: Microsoft Office Word heap-based buffer overflow

Source: https://junglewise.ai/threats/cve-2026-116719-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-2026-116719 · 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. This could allow an attacker to gain full control of the affected system, access sensitive documents, or install malware. No active exploitation has been observed yet.

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

## Quick answers

**Is CVE-2026-116719 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-116719 being exploited in the wild.

**How severe is CVE-2026-116719?** 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-2026-116719?** 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-2026-116719 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-116719?** 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 logic allows remote code execution when a user opens a specially crafted document. The vulnerability requires user interaction (opening a malicious file) but can be triggered over the network through document delivery mechanisms. An attacker gains arbitrary code execution with the privileges of the affected user.

## Affected products

- Microsoft Office Word

## Timeline

- 2026-11-10: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-116719](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-116719)

## 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)