Double free in Microsoft Office Outlook allows an unauthorized attacker to execute code over a network.
Fix
Microsoft's update · Critical
- Release Notes — Microsoft Office LTSC 2021 for 64-bit editions, Microsoft Office LTSC 2021 for 32-bit editions · build 16.0.14334.20974
- Release Notes — Microsoft Office LTSC 2024 for 64-bit editions, Microsoft Office LTSC 2024 for 32-bit editions · build 16.0.17932.21056
- Release Notes — Microsoft 365 Apps for Enterprise for 64-bit Systems, Microsoft 365 Apps for Enterprise for 32-bit Systems · build https://aka.ms/OfficeSecurityReleases
From the 2026-Oct release note of Microsoft's Security Update Guide, revised 2026-10-28 · Exploitation Less Likely.
Patch, vendor advisory and mitigation references on NVD 1
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 3
- Cpes+5 CPE criteria (now 5)NVD modified 2026-10-15 16:15
- StatusUndergoing Analysis → AnalyzedNVD modified 2026-10-15 16:15
- First seenCVSS 9.8NVD modified 2026-10-14 04:19
Affected (CPE criteria) 5
cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:*:*cpe:2.3:a:microsoft:office_2021:-:*:*:*:ltsc:-:x64:*cpe:2.3:a:microsoft:office_2021:-:*:*:*:ltsc:-:x86:*cpe:2.3:a:microsoft:office_2024:-:*:*:*:ltsc:-:x64:*cpe:2.3:a:microsoft:office_2024:-:*:*:*:ltsc:-:x86:*