CVE-2026-69588 Windows TCP/IP Denial of Service Vulnerability
An unauthorized attacker can cause a denial of service in Windows TCP/IP due to a memory leak, requiring a security patch.
- 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-2026-69588?
CVE-2026-69588 is a high-severity denial of service vulnerability in Microsoft Windows 11 23h2, published on 8 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Missing release of memory after effective lifetime in Windows TCP/IP allows an unauthorized attacker to deny service over a network.
Weakness: CWE-401
Which versions are affected by CVE-2026-69588?
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-2026-69588?
No fix has been published for CVE-2026-69588 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-2026-69588 being exploited?
There is no known exploitation of CVE-2026-69588 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-h3jj-c6v2-c99r.