CVE-2026-70575 Windows Schannel Denial of Service Vulnerability
An authorized attacker can cause a denial of service in Windows Schannel via a null pointer dereference.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-70575?
CVE-2026-70575 is a medium-severity vulnerability in Microsoft Windows 11 23h2, published on 8 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Null pointer dereference in Windows Schannel allows an authorized attacker to deny service over a network.
Weakness: CWE-476
Which versions are affected by CVE-2026-70575?
It affects 6 products.
Products include Microsoft Windows 11 23h2, Microsoft Windows 11 24h2, Microsoft Windows 11 25h2, Microsoft Windows 11 26h1, Microsoft Windows Server 2022, Microsoft Windows Server 2025.
How do I fix CVE-2026-70575?
No fix has been published for CVE-2026-70575 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-70575 being exploited?
There is no known exploitation of CVE-2026-70575 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Windows 11 23h2
- CVE-2026-81963 Microsoft Windows Link Following
- CVE-2026-100219 Microsoft QUIC Remote Code Execution Vulnerability
- CVE-2026-96909 Windows BitLocker Remote Code Execution Vulnerability
- CVE-2026-62815 Microsoft QUIC Remote Code Execution Vulnerability
- CVE-2026-45657 Windows Kernel Remote Code Execution Vulnerability
Sources
Also known as GHSA-7rwg-4366-4vj8.