CVE-2026-69434

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Heap-based Buffer Overflow in Windows URL Moniker

Publication date: 2026-09-08

Last updated on: 2026-09-08

Assigner: Microsoft Corporation

Description

Heap-based buffer overflow in Windows URL Moniker allows an unauthorized attacker to execute code over a network.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-09-08

Last Modified

2026-09-08

Generated

2026-09-09

AI Q&A

2026-09-09

EPSS Evaluated

N/A

NVD

CVE-2026-69434

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	url_moniker	*

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 the Windows URL Moniker component. It allows an unauthorized attacker to execute arbitrary code remotely over a network by exploiting a flaw in memory handling.

Impact Analysis

An attacker could exploit this to run malicious code on your system, potentially leading to data theft, system compromise, or further network infiltration. It requires user interaction but can be triggered remotely.

Compliance Impact

This vulnerability could lead to unauthorized data access or exfiltration, violating GDPR's data protection requirements and HIPAA's safeguards for protected health information. Organizations must patch to maintain compliance.

Mitigation Strategies

Apply the latest security updates from Microsoft to patch the heap-based buffer overflow in Windows URL Moniker. Disable or restrict access to URL Moniker functionality if not required until patched.

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