CVE-2026-70163 Microsoft OpenSSH for Windows Denial of Service Vulnerability
An unauthorized attacker can cause a denial of service in Microsoft OpenSSH for Windows by exploiting resource allocation limits.
- 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-2026-70163?
CVE-2026-70163 is a high-severity denial of service vulnerability in Microsoft Windows 10 1809, published on 13 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Allocation of resources without limits or throttling in OpenSSH for Windows allows an unauthorized attacker to deny service over a network.
Weakness: CWE-770
Which versions are affected by CVE-2026-70163?
It affects 11 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 5 more.
How do I fix CVE-2026-70163?
No fix has been published for CVE-2026-70163 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-70163 being exploited?
There is no known exploitation of CVE-2026-70163 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-xm7c-pq6h-c8j2.