CVE-2026-69858 Windows DNS Server Remote Code Execution Vulnerability
An unauthorized attacker can execute arbitrary code remotely via a use-after-free flaw in the Windows DNS Server.
- 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-2026-69858?
CVE-2026-69858 is a high-severity use after free vulnerability in Microsoft Windows Server 2022, published on 8 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Use after free in Windows DNS allows an unauthorized attacker to execute code over a network.
Weakness: CWE-416
Which versions are affected by CVE-2026-69858?
It affects 2 products.
Products include Microsoft Windows Server 2022, Microsoft Windows Server 2025.
How do I fix CVE-2026-69858?
No fix has been published for CVE-2026-69858 yet. Limit exposure of the affected software until one is available.
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-2026-69858 being exploited?
There is no known exploitation of CVE-2026-69858 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Windows Server 2022
- CVE-2022-34715 Windows Network File System Remote Code Execution Vulnerability
- CVE-2025-50171 Remote Desktop Spoofing Vulnerability
- CVE-2026-70167 Windows Domain Name Service Remote Code Execution Vulnerability
- CVE-2026-45648 Windows Active Directory Domain Services Remote Code Execution Vulnerability
- CVE-2024-30064 Windows Kernel Elevation of Privilege Vulnerability
Sources
Also known as GHSA-vrp7-ff8v-gvm9.