CVE-2026-83516 Windows Local Security Authority Subsystem Service (LSASS) Denial of Service Vulnerability
An out-of-bounds read in Windows LSASS allows remote attackers to cause a denial of service, requiring immediate patching.
- 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-2026-83516?
CVE-2026-83516 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
Out-of-bounds read in Windows Local Security Authority Subsystem Service (LSASS) allows an unauthorized attacker to deny service over a network.
Weakness: CWE-125
Which versions are affected by CVE-2026-83516?
It affects 8 products.
Products include Microsoft Windows 10 1809, Microsoft Windows 11 24h2, Microsoft Windows 11 25h2, Microsoft Windows 11 26h1, Microsoft Windows 11 26h2, Microsoft Windows Server 2019 and 2 more.
How do I fix CVE-2026-83516?
No fix has been published for CVE-2026-83516 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-2026-83516 being exploited?
There is no known exploitation of CVE-2026-83516 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-2h57-6pq7-qq64.