# CVE-2026-78441: Microsoft Windows OLE DB out-of-bounds read

Source: https://junglewise.ai/threats/cve-2026-78441-microsoft-windows-ole-db-out-of-bounds-read  
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-2026-78441 · Severity: medium · CVSS 6.5 · Published 2026-09-08

Windows OLE DB is a core database connectivity component used by many enterprise applications to access and manage data. An out-of-bounds memory read vulnerability allows an attacker on the network to extract sensitive information from affected systems without requiring authentication, potentially exposing confidential business data or system details.

Technologies: [Microsoft Windows OLE DB](https://junglewise.ai/threats/technologies/windows-ole-db). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2026-78441 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-78441 being exploited in the wild.

**How severe is CVE-2026-78441?** Medium severity, with a CVSS score of 6.5, published 8 September 2026.

**Which products and versions are affected?** Microsoft Windows OLE DB.

**Is there a fix for CVE-2026-78441?** 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-2026-78441 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-78441?** Check whether you run Microsoft Windows OLE DB. 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 an out-of-bounds read in Windows OLE DB (Object Linking and Embedding Database), a data-access layer component used by Windows and dependent applications. The flaw allows an attacker to read memory beyond intended boundaries, leading to information disclosure. The vulnerability is accessible over the network without requiring authentication. An attacker can exploit this to extract sensitive data from memory, such as credentials, encryption keys, or application data. A security patch is expected to be available from Microsoft.

## Affected products

- Microsoft Windows OLE DB

## Timeline

- 2026-09-08: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-78441](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-78441)

## Related threats

- [Windows OLE DB heap-based buffer overflow](https://junglewise.ai/threats/cve-2026-105587-heap-based-buffer-overflow-in-windows-ole-db-allows-an)
- [Microsoft Windows OLE DB heap overflow](https://junglewise.ai/threats/cve-2026-70210-heap-based-buffer-overflow-in-windows-ole-db-allows-an)