CVE-2026-83642: Windows DNS Server type confusion remote code execution

CVE-2026-83642 · Severity: high · CVSS 8.8 · Published 2026-10-13

Windows DNS Server, which manages domain name resolution for corporate networks, contains a type confusion vulnerability that allows an attacker to execute code remotely. An attacker on the network can exploit this flaw without authentication to gain arbitrary code execution on the DNS server, potentially compromising the entire network's name resolution infrastructure.

Technologies: Microsoft Windows DNS Server, Microsoft Windows 10 1607, Microsoft Windows 10 1809, Microsoft Windows 10 21h2, Microsoft Windows 10 22h2, Microsoft Windows 11 23h2, Microsoft Windows 11 24h2, Microsoft Windows 11 25h2, Microsoft Windows 11 26h1, Microsoft Windows 11 26h2, Microsoft Windows Server 2012, Microsoft Windows Server 2016, Microsoft Windows Server 2019, Microsoft Windows Server 2022, Microsoft Windows Server 2025. Vendors: Microsoft.

Quick answers

Is CVE-2026-83642 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-83642 being exploited in the wild.
How severe is CVE-2026-83642?
High severity, with a CVSS score of 8.8, published 13 October 2026.
Which products and versions are affected?
Microsoft Windows DNS Server.
Is there a fix for CVE-2026-83642?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-83642 attacked?
It is attacked over the network, in an operating system.
Am I affected by CVE-2026-83642?
Check whether you run Microsoft Windows DNS Server, Microsoft Windows 10 1607, Microsoft Windows 10 1809 or one of the others listed. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A type confusion vulnerability in Windows DNS Server allows an attacker to access resources using an incompatible type, leading to memory corruption and remote code execution. The attack is network-based and requires no authentication or user interaction. Successful exploitation grants the attacker arbitrary code execution on the affected DNS server.

Affected products

  • Microsoft Windows DNS Server

Timeline

  • 2026-10-13: disclosed

References

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