# CVE-2026-110049: Microsoft Word heap-based buffer overflow

Source: https://junglewise.ai/threats/cve-2026-110049-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-2026-110049 · Severity: high · CVSS 7.8 · Published 2026-11-10

Microsoft Word, a widely-used document editing application, contains a heap-based buffer overflow vulnerability that allows an attacker with local access to execute arbitrary code on the system. This could lead to complete compromise of the affected computer, including data theft, malware installation, or lateral movement to other systems on the network.

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

## Quick answers

**Is CVE-2026-110049 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-110049 being exploited in the wild.

**How severe is CVE-2026-110049?** High severity, with a CVSS score of 7.8, published 10 November 2026.

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

**Is there a fix for CVE-2026-110049?** 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-2026-110049 attacked?** It is attacked with local access, in a web application.

**Am I affected by CVE-2026-110049?** Check whether you run Microsoft 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 Word's document parsing code allows an attacker with local code execution capabilities to overwrite heap memory and achieve arbitrary code execution. The vulnerability requires local access and does not appear to be remotely exploitable without user interaction or additional attack vectors. No public exploit activity has been reported.

## Affected products

- Microsoft Word

## Timeline

- 2026-11-10: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-110049](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-110049)

## Related threats

- [Microsoft Word use-after-free remote code execution](https://junglewise.ai/threats/cve-2026-112735-use-after-free-in-microsoft-office-word-allows-an-unauthorized)
- [Microsoft Word heap-based buffer overflow](https://junglewise.ai/threats/cve-2026-112724-heap-based-buffer-overflow-in-microsoft-office-word-allows-an)
- [Microsoft Word heap-based buffer overflow](https://junglewise.ai/threats/cve-2026-112716-heap-based-buffer-overflow-in-microsoft-office-word-allows-an)
- [Microsoft Word heap-based buffer overflow](https://junglewise.ai/threats/cve-2026-111306-heap-based-buffer-overflow-in-microsoft-office-word-allows-an)
- [Microsoft Office Word heap-based buffer overflow](https://junglewise.ai/threats/cve-2026-110056-heap-based-buffer-overflow-in-microsoft-office-word-allows-an)