CVE-2026-62739 Windows HTTP.sys Elevation of Privilege Vulnerability
An authorized local attacker can exploit a heap-based buffer overflow in Windows HTTP.sys 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-2026-62739?
CVE-2026-62739 is a high-severity memory corruption vulnerability in Microsoft Windows 10 1809, published on 11 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Heap-based buffer overflow in Windows HTTP.sys allows an authorized attacker to elevate privileges locally.
Which versions are affected by CVE-2026-62739?
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-2026-62739?
No fix has been published for CVE-2026-62739 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-2026-62739 being exploited?
There is no known exploitation of CVE-2026-62739 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-v572-8pwj-5gcg.