CVE-2026-55029: Microsoft Excel Remote Code Execution Vulnerability
Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
Other sources
Microsoft Excel Remote Code Execution Vulnerability
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.5561.1001Patch KB5002886 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.111.26071215 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in https://aka.ms/OfficeSecurityReleases - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.10417.20175Patch KB5002884
Event History
Frequently Asked Questions
What is the severity of CVE-2026-55029?
CVE-2026-55029 has a high severity rating of 7.8.
How do I fix CVE-2026-55029?
To fix CVE-2026-55029, users should apply the latest security updates provided by Microsoft for their affected Office products.
What type of vulnerability is CVE-2026-55029?
CVE-2026-55029 is classified as a heap-based buffer overflow vulnerability.
Who is affected by CVE-2026-55029?
CVE-2026-55029 affects various versions of Microsoft Excel and Microsoft Office applications, including Microsoft 365 Apps for Enterprise.
What can an attacker achieve with CVE-2026-55029?
An attacker can exploit CVE-2026-55029 to execute arbitrary code on the affected system when a victim opens a specially crafted Excel file.