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Severe, 6 weeks1496Projects326

1496 severe, 6 weeks · 326 projects

MicrosoftCVE-2026-70125

Microsoft Office Outlook: heap buffer overflow

Microsoft

CVE-2026-70125 · Published Sep 23, 2026 · updated Oct 30, 2026

High7.8
No fix yet
Microsoft advisory

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

Affected versions

PackageAffectedFixed in
Microsoft 365 Apps for Enterprise
Product
>= 16.0.1, < https://aka.ms/OfficeSecurityReleaseshttps://aka.ms/OfficeSecurityReleases
Microsoft Office LTSC 2021
Product
>= 16.0.1, < https://aka.ms/OfficeSecurityReleaseshttps://aka.ms/OfficeSecurityReleases
Microsoft Office LTSC 2024
Product
>= 16.0.0, < https://aka.ms/OfficeSecurityReleaseshttps://aka.ms/OfficeSecurityReleases

Changes since it was listed

SummaryNov 3Summary: Microsoft Office Outlook Remote Code Execution Vulnerability to Heap-based buffer overflow in Microsoft Office Outlook allows an unauthorized attacker to execute code locally.
CVSS scoreNov 3CVSS score: 8.8 to 7.8
Details and references
CVSS 3.1
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Severity from
the vendor (its own CVE record or advisory)
Weakness
CWE-122

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