CVE-2026-108457 Microsoft Windows PDF Remote Code Execution Vulnerability
An out-of-bounds write in the Windows PDF component allows remote attackers to execute arbitrary code.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-108457?
CVE-2026-108457 is a high-severity memory corruption vulnerability in Microsoft Windows 10 21h2, published on 13 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Out-of-bounds write in Microsoft Windows PDF allows an unauthorized attacker to execute code over a network.
Weakness: CWE-787
Which versions are affected by CVE-2026-108457?
It affects 5 products.
Products include Microsoft Windows 10 21h2, Microsoft Windows 10 22h2, Microsoft Windows 11 23h2, Microsoft Windows Server 2022, Microsoft Windows Server 2025.
How do I fix CVE-2026-108457?
No fix has been published for CVE-2026-108457 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-108457 being exploited?
There is no known exploitation of CVE-2026-108457 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Windows 10 21h2
- CVE-2025-21333 Microsoft Windows Hyper-V NT Kernel Integration VSP Heap-based Buffer Overflow
- CVE-2025-21334 Microsoft Windows Hyper-V NT Kernel Integration VSP Use-After-Free
- CVE-2025-21335 Microsoft Windows Hyper-V NT Kernel Integration VSP Use-After-Free
- CVE-2026-42904 Windows TCP/IP Elevation of Privilege Vulnerability
- CVE-2026-105733 Windows Hyper-V Remote Code Execution Vulnerability
Sources
Also known as GHSA-5vcp-c5rc-rq78.