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High severity7.8NVD Advisory· Published Aug 11, 2026· Updated Aug 14, 2026

CVE-2026-58651

CVE-2026-58651

Description

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

Affected products

10
  • Microsoft/Office Wordllm-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/Microsoft 365
    cpe:2.3:a:microsoft:microsoft_365:-:*:*:*:*:macos:*:*
  • Microsoft/Office6 versions
    cpe:2.3:a:microsoft:office_2021:-:*:*:*:ltsc:-:x64:*+ 5 more
    • 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:-:*

Patches

Vulnerability mechanics

References

1

News mentions

3