CVE-2026-78509

CriticalCVSS 9.8/10Last modified Sep 17, 2026

Description

Heap-based buffer overflow in Microsoft Office Outlook allows an unauthorized attacker to execute code over a network.

Metrics

CVSS 3.1 9.8/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-122

Affected software

No affected versions have been published.

Timeline

Published
Sep 8, 2026
Last modified
Sep 17, 2026
NVD status
Analyzed

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CVE-2026-78509: Critical severity, CVSS 9.8 | Vulnix