Out-of-bounds write in Microsoft Windows and Windows Server - CVE-2026-108457
Published: October 13, 2026
Vulnerability identifier: #VU154365
CSH Severity: High
CVSS v4: 9.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-108457
CWE-ID: CWE-787
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to an out-of-bounds write in Microsoft Windows PDF when automatically processing PDF content. A remote attacker can send a specially crafted email attachment to an affected system to execute arbitrary code.
No user interaction is required. Successful exploitation requires a deep understanding of the target system and depends on environmental and configuration factors.
Affected software
Microsoft Windows
Windows Server
Windows Server
How to mitigate CVE-2026-108457
Install security update from vendor's website.
Microsoft Windows - addressed in versions 10 21H2 10.0.19044.7807, 11 23H2 10.0.22631.7652
Windows Server - addressed in versions 2022 10.0.20348.5761, 2025 10.0.26100.33650
Windows Server - addressed in versions 2022 10.0.20348.5761, 2025 10.0.26100.33650