CVE-2026-77491

Analyzed Analyzed - Analysis Complete

Out-of-Bounds Read in Windows GDI

Publication date: 2026-09-08

Last updated on: 2026-09-24

Assigner: Microsoft Corporation

Description

Out-of-bounds read in Windows GDI allows an unauthorized attacker to disclose information locally.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-09-08

Last Modified

2026-09-24

Generated

2026-09-29

AI Q&A

2026-09-09

EPSS Evaluated

2026-09-27

NVD

CVE-2026-77491

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	windows_gdi	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-125	The product reads data past the end, or before the beginning, of the intended buffer.

Attack-Flow Graph

Executive Summary

This vulnerability is an out-of-bounds read in Windows GDI (Graphics Device Interface). It allows an unauthorized attacker to read memory outside the intended buffer, potentially exposing sensitive information on the local system.

Impact Analysis

An attacker could exploit this to access confidential data stored in memory, such as passwords or encryption keys, on your local machine. The impact is limited to information disclosure and requires some user interaction.

Compliance Impact

This vulnerability could lead to unauthorized data exposure, violating GDPR's data protection principles or HIPAA's safeguards for protected health information. Organizations may face compliance penalties if exploited.

Mitigation Strategies

Apply the latest Windows security updates from Microsoft to patch the GDI out-of-bounds read vulnerability. Monitor Microsoft's security advisories for updates and ensure all systems are updated promptly.

Hi! I’m here to help you understand CVE-2026-77491. Ask me anything about the vulnerability, its impact, or mitigation strategies.

0/70