CVE-2026-108457: Microsoft Windows PDF Remote Code Execution Vulnerability

Overview

Severity

High (CVSS 8.1)

CVSS Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

Category

Remote Code Execution

Exploit Status

Not Exploited

Exploitation Likelihood

Less Likely

Patch Tuesday

2026-Oct

Released

2026-10-13

Description

Out-of-bounds write in Microsoft Windows PDF allows an unauthorized attacker to execute code over a network.

FAQ

How could an attacker exploit this vulnerability? An unauthenticated attacker could send a specially crafted email attachment to an affected system that automatically processes PDF content. Successful exploitation could allow the attacker to execute code on the target system. No user interaction is required. According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability? Successful exploitation of this vulnerability requires an attacker to have a deep understanding of the system. Successful exploitation is not guaranteed and depends on a combination of factors that might include the environment, system configuration, and the presence of additional security measures.

Affected Products (12)

Windows

• Windows 11 Version 23H2 for x64-based Systems
• Windows 10 Version 21H2 for ARM64-based Systems
• Windows Server 2022 (Server Core installation)
• Windows Server 2022
• Windows 10 Version 21H2 for x64-based Systems
• Windows 11 Version 23H2 for ARM64-based Systems
• Windows 10 Version 21H2 for 32-bit Systems
• Windows Server 2025 (Server Core installation)
• Windows Server 2025

ESU

• Windows 10 Version 22H2 for x64-based Systems
• Windows 10 Version 22H2 for ARM64-based Systems
• Windows 10 Version 22H2 for 32-bit Systems

Security Updates (4)

• 5126653
• 5126657
• 5126655
• 5126646

Acknowledgments

Anonymous

Revision History

• 2026-10-13: Information published.