CVE-2026-108448: Microsoft Office Outlook heap-based buffer overflow

CVE-2026-108448 · Severity: high · CVSS 7.5 · Published 2026-10-15

Microsoft Outlook is an email and calendar application used by millions for business communications. A heap-based buffer overflow vulnerability allows an attacker on the network to execute malicious code with Outlook's privileges, potentially compromising email data, stealing credentials, or spreading malware.

Technologies: Microsoft Office Outlook. Vendors: Microsoft.

Quick answers

Is CVE-2026-108448 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-108448 being exploited in the wild.
How severe is CVE-2026-108448?
High severity, with a CVSS score of 7.5, published 15 October 2026.
Which products and versions are affected?
Microsoft Office Outlook.
Is there a fix for CVE-2026-108448?
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-2026-108448 attacked?
It is attacked over the network, in a web application.
Am I affected by CVE-2026-108448?
Check whether you run Microsoft Office Outlook. 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 Outlook allows remote code execution over the network. The vulnerability likely requires network connectivity but does not explicitly require authentication or user interaction; an attacker can send a crafted message or file to trigger the overflow. Exploitation results in arbitrary code execution within the Outlook process context.

Affected products

  • Microsoft Office Outlook

Timeline

  • 2026-10-15: disclosed

References

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