CVE-2026-70346

HighCVSS 7.8/10Last modified Aug 16, 2026

Description

Stack-based buffer overflow in Windows Installer allows an authorized attacker to elevate privileges locally.

Metrics

CVSS 3.1 7.8/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-121

Affected software

VendorProductVersions
MicrosoftWindows 10 Version 1607>= 10.0.14393.0, < 10.0.14393.9418
MicrosoftWindows 10 Version 1809>= 10.0.17763.0, < 10.0.17763.9121
MicrosoftWindows 10 Version 21H2>= 10.0.19044.0, < 10.0.19044.7663
MicrosoftWindows 10 Version 22H2>= 10.0.19045.0, < 10.0.19045.7663
MicrosoftWindows 11 version 23H2>= 10.0.22631.0, < 10.0.22631.7517
MicrosoftWindows 11 Version 23H2>= 10.0.22631.0, < 10.0.22631.7517
MicrosoftWindows 11 Version 24H2>= 10.0.26100.0, < 10.0.26100.9168
MicrosoftWindows 11 Version 25H2>= 10.0.26200.0, < 10.0.26200.9168
MicrosoftWindows 11 version 26H1>= 10.0.28000.0, < 10.0.28000.2704
MicrosoftWindows Server 2012>= 6.2.9200.0, < 6.2.9200.26280
MicrosoftWindows Server 2012 (Server Core installation)>= 6.2.9200.0, < 6.2.9200.26280
MicrosoftWindows Server 2012 R2>= 6.3.9600.0, < 6.3.9600.23338
MicrosoftWindows Server 2012 R2 (Server Core installation)>= 6.3.9600.0, < 6.3.9600.23338
MicrosoftWindows Server 2016>= 10.0.14393.0, < 10.0.14393.9418
MicrosoftWindows Server 2016 (Server Core installation)>= 10.0.14393.0, < 10.0.14393.9418
MicrosoftWindows Server 2019>= 10.0.17763.0, < 10.0.17763.9121
MicrosoftWindows Server 2019 (Server Core installation)>= 10.0.17763.0, < 10.0.17763.9121
MicrosoftWindows Server 2022>= 10.0.20348.0, < 10.0.20348.5499
MicrosoftWindows Server 2025>= 10.0.26100.0, < 10.0.26100.33296
MicrosoftWindows Server 2025 (Server Core installation)>= 10.0.26100.0, < 10.0.26100.33296

References

Timeline

Published
Aug 11, 2026
Last modified
Aug 16, 2026
NVD status
Analyzed

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CVE-2026-70346: High severity, CVSS 7.8 | Vulnix