High severity7.8NVD Advisory· Published Jul 14, 2026· Updated Jul 15, 2026

CVE-2026-55137

Description

Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally.

Microsoft/Office Excelllm-fuzzy
Microsoft/365 Apps2 versions
cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x64:*+ 1 more
- cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x64:*
- cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x86:*
Microsoft/Excel2 versions
cpe:2.3:a:microsoft:excel:2016:*:*:*:*:*:x64:*+ 1 more
- cpe:2.3:a:microsoft:excel:2016:*:*:*:*:*:x64:*
- cpe:2.3:a:microsoft:excel:2016:*:*:*:*:*:x86:*
Microsoft/Microsoft 365
cpe:2.3:a:microsoft:microsoft_365:-:*:*:*:*:macos:*:*
Microsoft/Office8 versions
cpe:2.3:a:microsoft:office_2019:-:*:*:*:*:*:x64:*+ 7 more
- cpe:2.3:a:microsoft:office_2019:-:*:*:*:*:*:x64:*
- cpe:2.3:a:microsoft:office_2019:-:*:*:*:*:*:x86:*
- cpe:2.3:a:microsoft:office_2021:-:*:*:*:ltsc:-:x64:*
- cpe:2.3:a:microsoft:office_2021:-:*:*:*:ltsc:-:x86:*
- cpe:2.3:a:microsoft:office_2021:-:*:*:*:ltsc:macos:-:*
- cpe:2.3:a:microsoft:office_2024:-:*:*:*:ltsc:-:x64:*
- cpe:2.3:a:microsoft:office_2024:-:*:*:*:ltsc:-:x86:*
- cpe:2.3:a:microsoft:office_2024:-:*:*:*:ltsc:macos:-:*
Microsoft/Office Online Server
cpe:2.3:a:microsoft:office_online_server:*:*:*:*:*:*:*:*
Range: <16.0.10417.20175