# CVE-2026-109498: Microsoft Office Access heap-based buffer overflow

Source: https://junglewise.ai/threats/cve-2026-109498-heap-based-buffer-overflow-in-microsoft-office-access-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-2026-109498 · Severity: high · CVSS 7.5 · Published 2026-11-10

Microsoft Office Access, a database management tool used by organizations, contains a heap-based buffer overflow vulnerability that allows an attacker to execute arbitrary code remotely. An attacker can exploit this flaw by sending a specially crafted file over the network to compromise a user's system, potentially leading to data theft, system takeover, or lateral movement within a corporate network.

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

## Quick answers

**Is CVE-2026-109498 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-109498 being exploited in the wild.

**How severe is CVE-2026-109498?** High severity, with a CVSS score of 7.5, published 10 November 2026.

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

**Is there a fix for CVE-2026-109498?** 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-2026-109498 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-109498?** Check whether you run Microsoft Office Access. 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 malformed input, exploitable over a network without authentication. The vulnerability exists in the database file parsing logic and requires no user interaction beyond opening a crafted file. Successful exploitation grants an attacker arbitrary code execution in the context of the Access process.

## Affected products

- Microsoft Office Access

## Timeline

- 2026-11-10: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-109498](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-109498)

## Related threats

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