CVE-2026-69635

Analyzed Analyzed - Analysis Complete

Heap-based Buffer Overflow in Windows Installer

Publication date: 2026-10-13

Last updated on: 2026-10-26

Assigner: Microsoft Corporation

Description

Heap-based buffer overflow in Windows Installer allows an authorized attacker to elevate privileges with a physical attack.

CVSS Scores

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Meta Information

Published

2026-10-13

Last Modified

2026-10-26

Generated

2026-11-08

AI Q&A

2026-10-14

EPSS Evaluated

2026-11-07

NVD

CVE-2026-69635

EUVD

EUVD-2026-99896

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	windows_server_2012	r2
microsoft	windows_server_2012	*
microsoft	windows_10_1607	to 10.0.14393.9612 (exc)
microsoft	windows_10_1607	to 10.0.14393.9612 (exc)
microsoft	windows_10_1809	to 10.0.17763.9376 (exc)
microsoft	windows_10_1809	to 10.0.17763.9376 (exc)
microsoft	windows_10_21h2	to 10.0.19044.7807 (exc)
microsoft	windows_10_21h2	to 10.0.19044.7807 (exc)
microsoft	windows_10_21h2	to 10.0.19044.7807 (exc)
microsoft	windows_11_23h2	to 10.0.22631.7652 (exc)
microsoft	windows_11_23h2	to 10.0.22631.7652 (exc)
microsoft	windows_11_24h2	to 10.0.26100.9711 (exc)
microsoft	windows_11_24h2	to 10.0.26100.9711 (exc)
microsoft	windows_11_25h2	to 10.0.26200.9711 (exc)
microsoft	windows_11_25h2	to 10.0.26200.9711 (exc)
microsoft	windows_11_26h1	to 10.0.28000.3231 (exc)
microsoft	windows_11_26h1	to 10.0.28000.3231 (exc)
microsoft	windows_11_26h2	to 10.0.26300.9711 (exc)
microsoft	windows_11_26h2	to 10.0.26300.9711 (exc)
microsoft	windows_server_2025	to 10.0.26100.33650 (exc)
microsoft	windows_server_2022	to 10.0.20348.5761 (exc)
microsoft	windows_server_2016	to 10.0.14393.9612 (exc)
microsoft	windows_server_2019	to 10.0.17763.9376 (exc)
microsoft	windows_10_22h2	to 10.0.19045.7807 (exc)
microsoft	windows_10_22h2	to 10.0.19045.7807 (exc)
microsoft	windows_10_22h2	to 10.0.19045.7807 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-122	A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().

Attack-Flow Graph

Executive Summary

This is a heap-based buffer overflow vulnerability in Windows Installer. It allows an authorized attacker with physical access to a system to elevate their privileges by exploiting a flaw in memory handling during installation processes.

Detection Guidance

This vulnerability requires physical access and involves a heap-based buffer overflow in Windows Installer. Detection may involve monitoring for unusual installer activity or privilege escalation attempts. Check Windows Event Logs for installer-related errors or unexpected privilege changes. Use system monitoring tools like Process Monitor to observe installer behavior.

Impact Analysis

An attacker with physical access could exploit this to gain higher privileges on your system, potentially allowing them to install malicious software, access sensitive data, or take control of the affected machine.

Compliance Impact

This vulnerability allows privilege escalation via a physical attack, which could lead to unauthorized access to sensitive data. Such access may violate compliance requirements under GDPR (data protection) and HIPAA (health information security) by enabling unauthorized data exposure or modification.

Mitigation Strategies

Apply the latest Windows updates from Microsoft Update to patch the heap-based buffer overflow in Windows Installer. Ensure all systems listed in the CPEs are updated to the latest version.

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