# CVE-2026-105597: Microsoft Office Access heap-based buffer overflow

Source: https://junglewise.ai/threats/cve-2026-105597-heap-based-buffer-overflow-in-microsoft-office-access-allows-an  
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-2026-105597 · Severity: high · CVSS 8.8 · Published 2026-10-13

Microsoft Office Access, a database management tool used by businesses to store and manage organizational data, contains a heap-based buffer overflow vulnerability. An attacker with network access could exploit this flaw to execute arbitrary code on a user's computer, potentially leading to data theft, system compromise, or installation of malware.

Technologies: [Microsoft 365 Apps](https://junglewise.ai/threats/technologies/365-apps), [Microsoft Office 2021](https://junglewise.ai/threats/technologies/office-2021), [Microsoft Office 2024](https://junglewise.ai/threats/technologies/office-2024), [Microsoft Office Access](https://junglewise.ai/threats/technologies/office-access). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2026-105597 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-105597 being exploited in the wild.

**How severe is CVE-2026-105597?** High severity, with a CVSS score of 8.8, published 13 October 2026.

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

**Is there a fix for CVE-2026-105597?** 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-2026-105597 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-105597?** Check whether you run Microsoft 365 Apps, Microsoft Office 2021, Microsoft Office 2024 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

A heap-based buffer overflow in Microsoft Office Access allows remote code execution when processing specially crafted input. The vulnerability is reachable over the network and permits an attacker to execute arbitrary code with the privileges of the user running Access. No active exploitation in the wild has been reported at the time of publication.

## Affected products

- Microsoft Office Access

## Timeline

- 2026-10-13: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-105597](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-105597)

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