Main Vulnerability Database Vulnerabilities #VU165124

Double free in Microsoft products - CVE-2026-118719

Published: November 11, 2026

Vulnerability identifier: #VU165124

CSH Severity: High

CVSS v4: 8.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-118719

CWE-ID: CWE-415

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to execute arbitrary code.

The vulnerability exists due to double free in Microsoft Office Excel when processing a specially crafted file. A remote attacker can trick a user into opening a specially crafted file to execute arbitrary code.

The Preview Pane is not an attack vector for this vulnerability.

Affected software

Microsoft Office for macOS
Microsoft Office
Office Online Server

How to mitigate CVE-2026-118719

Install security update from vendor's website.

Microsoft Office for macOS - update to 16.115.26110837
Office Online Server - update to 16.0.10417.20236
Microsoft Office - addressed in versions 16.0.14334.21048, 16.0.17932.21140

External References

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2026-118719

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