# CVE-2026-80085: Microsoft Office Word heap buffer overflow

Source: https://junglewise.ai/threats/cve-2026-80085-microsoft-office-word-heap-buffer-overflow  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-08. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-80085 · Severity: high · CVSS 8.8 · Published 2026-09-08

Microsoft Office Word is widely used for document creation and editing across enterprises. A heap-based buffer overflow vulnerability allows attackers to execute arbitrary code on a user's system when opening a malicious document, potentially leading to unauthorized data access, system compromise, or lateral movement within a network.

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

## Quick answers

**Is CVE-2026-80085 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-80085 being exploited in the wild.

**How severe is CVE-2026-80085?** High severity, with a CVSS score of 8.8, published 8 September 2026.

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

**Is there a fix for CVE-2026-80085?** 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-2026-80085 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-80085?** 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

This vulnerability is a heap-based buffer overflow in Microsoft Office Word's document processing logic. The flaw can be exploited by sending a specially crafted document file to a user, triggering memory corruption during parsing. An attacker with network access can exploit this without requiring authentication or user interaction beyond opening the document. Successful exploitation results in arbitrary code execution with the privileges of the Word process, enabling data theft, malware installation, or further network compromise. A patch is expected to be available through Microsoft's security update channels.

## Affected products

- Microsoft Office Word

## Timeline

- 2026-09-08: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-80085](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-80085)

## 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)