CVE-2026-78509 | Microsoft Office/Outlook heap-based overflow

September 9, 2026 Yanac

A vulnerability was found in Microsoft Office and Outlook. It has been rated as critical. This issue affects some unknown processing. This manipulation causes heap-based buffer overflow.

This vulnerability is registered as CVE-2026-78509. Remote exploitation of the attack is possible. No exploit is available.

It is recommended to apply a patch to fix this issue.VulDB Recent EntriesRead More