CVE-2026-111306: Microsoft Word heap-based buffer overflow

CVE-2026-111306 · Severity: high · CVSS 8.8 · Published 2026-11-10

Microsoft Word contains a heap-based buffer overflow vulnerability that can be exploited by an attacker to execute arbitrary code on a user's computer. An attacker could deliver a malicious Word document that, when opened, runs code with the privileges of the user, potentially leading to data theft, installation of malware, or system compromise.

Technologies: Microsoft Word. Vendors: Microsoft.

Quick answers

Is CVE-2026-111306 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-111306 being exploited in the wild.
How severe is CVE-2026-111306?
High severity, with a CVSS score of 8.8, published 10 November 2026.
Which products and versions are affected?
Microsoft Word.
Is there a fix for CVE-2026-111306?
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-2026-111306 attacked?
It is attacked over the network, in a software library.
Am I affected by CVE-2026-111306?
Check whether you run Microsoft Word. 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 Word's document processing logic, allowing code execution via a specially crafted document. The vulnerability requires user interaction (opening a malicious document) but does not require authentication. An attacker can achieve arbitrary code execution in the context of the affected user.

Affected products

  • Microsoft Word

Timeline

  • 2026-11-10: disclosed

References

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