CVE-2026-42837 Windows Projected File System Elevation of Privilege Vulnerability
An out-of-bounds read in the Windows Projected File System Filter Driver allows local attackers to elevate privileges.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-42837?
CVE-2026-42837 is a high-severity memory corruption vulnerability in Microsoft Windows 10 1809, published on 9 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Out-of-bounds read in Windows Projected File System Filter Driver allows an authorized attacker to elevate privileges locally.
Weakness: CWE-125
Which versions are affected by CVE-2026-42837?
It affects 10 products.
Products include Microsoft Windows 10 1809, Microsoft Windows 10 21h2, Microsoft Windows 10 22h2, Microsoft Windows 11 23h2, Microsoft Windows 11 24h2, Microsoft Windows 11 25h2 and 4 more.
How do I fix CVE-2026-42837?
No fix has been published for CVE-2026-42837 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-2026-42837 being exploited?
There is no known exploitation of CVE-2026-42837 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Windows 10 1809
- CVE-2024-29988 Microsoft SmartScreen Prompt Security Feature Bypass
- CVE-2024-21412 Microsoft Windows Internet Shortcut Files Security Feature Bypass
- CVE-2025-62221 Microsoft Windows Use After Free
- CVE-2025-30400 Microsoft Windows DWM Core Library Use-After-Free
- CVE-2024-21338 Microsoft Windows Kernel Exposed IOCTL with Insufficient Access Control
Sources
Also known as GHSA-c2vf-vxwf-338g.