CVE-2026-119997: Microsoft Office Outlook heap buffer overflow

CVE-2026-119997 · Severity: high · CVSS 7.8 · Published 2026-11-10

Microsoft Outlook is an email and calendar application used by millions of business and personal users. A heap-based buffer overflow vulnerability in Outlook could allow an attacker with local access to execute arbitrary code with the privileges of the user running Outlook, potentially leading to data theft, malware installation, or further system compromise.

Technologies: Microsoft Office Outlook. Vendors: Microsoft.

Quick answers

Is CVE-2026-119997 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-119997 being exploited in the wild.
How severe is CVE-2026-119997?
High severity, with a CVSS score of 7.8, published 10 November 2026.
Which products and versions are affected?
Microsoft Office Outlook.
Is there a fix for CVE-2026-119997?
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-2026-119997 attacked?
It is attacked with local access.
Am I affected by CVE-2026-119997?
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 exists in Microsoft Office Outlook that can be triggered through local attack vectors. The vulnerability allows an attacker with local access to execute arbitrary code in the context of the Outlook process. A fix is expected to be available in an upcoming Microsoft security update.

Affected products

  • Microsoft Office Outlook

Timeline

  • 2026-11-10: disclosed

References

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