CVE-2026-70346

Analyzed Analyzed - Analysis Complete

Windows Installer Stack-Based Buffer Overflow

Publication date: 2026-08-11

Last updated on: 2026-08-16

Assigner: Microsoft Corporation

Description

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

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-08-11

Last Modified

2026-08-16

Generated

2026-09-01

AI Q&A

2026-08-12

EPSS Evaluated

2026-08-30

NVD

CVE-2026-70346

EUVD

EUVD-2026-56598

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	windows_server_2012	r2
microsoft	windows_10_1607	to 10.0.14393.9418 (exc)
microsoft	windows_10_1607	to 10.0.14393.9418 (exc)
microsoft	windows_10_1809	to 10.0.17763.9115 (exc)
microsoft	windows_10_1809	to 10.0.17763.9115 (exc)
microsoft	windows_10_21h2	to 10.0.19044.7663 (exc)
microsoft	windows_10_21h2	to 10.0.19044.7663 (exc)
microsoft	windows_10_21h2	to 10.0.19044.7663 (exc)
microsoft	windows_10_22h2	to 10.0.19045.7663 (exc)
microsoft	windows_10_22h2	to 10.0.19045.7663 (exc)
microsoft	windows_10_22h2	to 10.0.19045.7663 (exc)
microsoft	windows_11_23h2	to 10.0.22631.7517 (exc)
microsoft	windows_11_23h2	to 10.0.22631.7517 (exc)
microsoft	windows_11_24h2	to 10.0.26100.9106 (exc)
microsoft	windows_11_24h2	to 10.0.26100.9106 (exc)
microsoft	windows_11_26h1	to 10.0.28000.2704 (exc)
microsoft	windows_11_26h1	to 10.0.28000.2704 (exc)
microsoft	windows_11_25h2	to 10.0.26200.9106 (exc)
microsoft	windows_11_25h2	to 10.0.26200.9106 (exc)
microsoft	windows_server_2016	to 10.0.14393.9418 (exc)
microsoft	windows_server_2019	to 10.0.17763.9115 (exc)
microsoft	windows_server_2022	to 10.0.20348.5440 (exc)
microsoft	windows_server_2025	to 10.0.26100.33222 (exc)
microsoft	windows_server_2012	to 6.2.9200.26280 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-121	A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).

Attack-Flow Graph

Executive Summary

This is a stack-based buffer overflow in Windows Installer. It allows an authorized attacker with local access to elevate their privileges on the system.

Detection Guidance

This vulnerability involves a stack-based buffer overflow in Windows Installer. Detection requires checking for unusual privilege escalation attempts or crashes in Windows Installer processes. Monitor logs for installer-related errors or unexpected system behavior. Use Windows Event Viewer to inspect Security and System logs for suspicious activity.

Impact Analysis

An attacker could exploit this to gain higher-level permissions on your system, potentially allowing them to install malicious software, view or delete data, or create new accounts with full user rights.

Compliance Impact

This vulnerability could lead to unauthorized access or privilege escalation, which may violate compliance requirements for data protection standards like GDPR or HIPAA by allowing unauthorized changes to sensitive systems or data.

Mitigation Strategies

Apply the latest security updates from Microsoft to patch the Windows Installer buffer overflow vulnerability. Monitor Microsoft's update guide for the official patch and install it as soon as possible.

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