CVE-2026-68820 Microsoft Windows Ancillary Function Driver for WinSock Use-After-Free
A use-after-free flaw in the Windows Ancillary Function Driver for WinSock allows local attackers to elevate privileges.
- Exploited in the wild
- Since 11 Aug 2026
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-68820?
CVE-2026-68820 is a high-severity use after free vulnerability in Microsoft Windows 10 1607, 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
Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
Weakness: CWE-416
Which versions are affected by CVE-2026-68820?
It affects 13 products.
Products include Microsoft Windows 10 1607, Microsoft Windows 10 1809, Microsoft Windows 10 21h2, Microsoft Windows 10 22h2, Microsoft Windows 11 23h2, Microsoft Windows 11 24h2 and 7 more.
How do I fix CVE-2026-68820?
No fix has been published for CVE-2026-68820 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 25 Aug 2026.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-68820 being exploited?
Yes. Attackers have exploited CVE-2026-68820 in the wild since at least 11 Aug 2026.
Public exploit code: 4 proofs of concept on GitHub.
Other vulnerabilities in Microsoft Windows 10 1607
- CVE-2026-33824 Microsoft Internet Key Exchange (IKE) Service Extensions Double Free
- CVE-2026-21510 Microsoft Windows Shell Protection Mechanism Failure
- CVE-2026-21513 Microsoft MSHTML Framework Protection Mechanism Failure
- CVE-2023-32049 Microsoft Windows Defender SmartScreen Security Feature Bypass
- CVE-2023-29360 Microsoft Streaming Service Untrusted Pointer Dereference
Sources
Also known as GHSA-c433-3382-mw5v.