CVE-2026-21246

Analyzed Analyzed - Analysis Complete

Heap-Based Buffer Overflow in Microsoft Graphics Enables Privilege Escalation

Publication date: 2026-02-10

Last updated on: 2026-02-11

Assigner: Microsoft Corporation

Description

Heap-based buffer overflow in Microsoft Graphics Component allows an authorized attacker to elevate privileges locally.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-02-10

Last Modified

2026-02-11

Generated

2026-07-06

AI Q&A

2026-02-10

EPSS Evaluated

2026-07-05

NVD

CVE-2026-21246

EUVD

EUVD-2026-7350

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	windows_server_2012	r2
microsoft	windows_server_2012	*
microsoft	windows_10_1607	to 10.0.14393.8868 (exc)
microsoft	windows_10_1607	to 10.0.14393.8868 (exc)
microsoft	windows_10_1809	to 10.0.17763.8389 (exc)
microsoft	windows_server_2016	to 10.0.14393.8868 (exc)
microsoft	windows_server_2019	to 10.0.17763.8389 (exc)
microsoft	windows_server_2022	to 10.0.20348.4711 (exc)
microsoft	windows_server_2025	to 10.0.26100.32313 (exc)
microsoft	windows_11_24h2	to 10.0.26100.7781 (exc)
microsoft	windows_11_24h2	to 10.0.26100.7781 (exc)
microsoft	windows_11_23h2	to 10.0.22631.6649 (exc)
microsoft	windows_11_23h2	to 10.0.22631.6649 (exc)
microsoft	windows_11_25h2	to 10.0.26200.7781 (exc)
microsoft	windows_11_25h2	to 10.0.26200.7781 (exc)
microsoft	windows_server_2022_23h2	to 10.0.25398.2149 (exc)
microsoft	windows_10_22h2	to 10.0.19045.6937 (exc)
microsoft	windows_10_22h2	to 10.0.19045.6937 (exc)
microsoft	windows_10_22h2	to 10.0.19045.6937 (exc)
microsoft	windows_10_21h2	to 10.0.19044.6937 (exc)
microsoft	windows_10_21h2	to 10.0.19044.6937 (exc)
microsoft	windows_10_21h2	to 10.0.19044.6937 (exc)
microsoft	windows_10_1809	to 10.0.17763.8389 (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().
CWE-787	The product writes data past the end, or before the beginning, of the intended buffer.

Attack-Flow Graph

Impact Analysis

An attacker who already has some level of access to the system can exploit this vulnerability to gain higher privileges.

This elevation of privilege can lead to unauthorized actions, potentially compromising the confidentiality, integrity, and availability of the system.

Executive Summary

This vulnerability is a heap-based buffer overflow in the Microsoft Graphics Component.

It allows an authorized attacker to elevate their privileges locally on the affected system.

Compliance Impact

I don't know

Detection Guidance

I don't know

Mitigation Strategies

The vulnerability is a heap-based buffer overflow in the Microsoft Graphics Component that allows local privilege escalation by an authorized attacker.

To mitigate this vulnerability, it is recommended to apply the security updates provided by Microsoft as soon as possible.

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