CVE-2026-69813 – Windows DNS Server Remote Code Execution Vulnerability

CVE-2026-69813 is a critical use-after-free vulnerability in Windows DNS that can allow an unauthorized attacker to execute code over a network. Exploitation requires winning a race condition, making the attack complexity high. The vulnerability requires no privileges and no user interaction, and successful exploitation can have a high impact on confidentiality, integrity, and availability.

CVSS SCORE: 8.1.

SEVERITY: Critical.

THREAT: An unauthorized network attacker could exploit the Windows DNS use-after-free condition to achieve remote code execution. Although exploitation is rated less likely because the attacker must successfully win a race condition, a successful attack could severely affect the compromised system.

EXPLOITS: This vulnerability is not publicly disclosed and is not reported as exploited. Exploit code maturity is rated Unproven, so confirmed public exploit or proof-of-concept code cannot be established.

TECHNICAL SUMMARY: CVE-2026-69813 is caused by a use-after-free weakness (CWE-416) in Windows DNS. The flaw occurs when software continues to use memory after it has been freed. An unauthorized attacker can target the vulnerability over a network and, with successful exploitation, execute code remotely by calling arbitrary endpoints. Exploitation has high complexity because the attacker must win a race condition. The attack requires no privileges or user interaction, with scope remaining unchanged. Successful exploitation can result in high confidentiality, integrity, and availability impact.

EXPLOITABILITY: Affected software includes Windows 10 versions 1607 and 1809; Windows Server 2012, 2012 R2, 2016, 2019, 2022, and 2025, including the listed Server Core installations. Exploitation is possible over a network without privileges or user interaction but requires winning a race condition.

BUSINESS IMPACT: Successful remote code execution could expose sensitive information, compromise system integrity, and disrupt availability. For organizations operating affected Windows systems, compromise of systems providing DNS functionality could create significant operational and security consequences.

WORKAROUND: No workaround or mitigation is specified. An official fix is identified as the remediation.

URGENCY: This vulnerability is rated Critical and can result in remote code execution with high confidentiality, integrity, and availability impact. Although it is not reported as exploited and exploitation is assessed as less likely, affected systems should receive the official fix promptly because a successful attack requires neither privileges nor user interaction.