CVE-2026-97817: Windows DNS Server heap buffer overflow information disclosure

CVE-2026-97817 · Severity: medium · CVSS 6.5 · Published 2026-10-13

Windows DNS Server is a critical networking service that translates domain names to IP addresses. A heap-based buffer overflow in the DNS Server allows an authorized attacker to read sensitive information from the server's memory and transmit it over the network, potentially exposing credentials, encryption keys, or other confidential data.

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-2026-97817 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-97817 being exploited in the wild.
How severe is CVE-2026-97817?
Medium severity, with a CVSS score of 6.5, published 13 October 2026.
Which products and versions are affected?
Microsoft Windows DNS Server.
Is there a fix for CVE-2026-97817?
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-2026-97817 attacked?
It is attacked over the network, in an operating system.
Am I affected by CVE-2026-97817?
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 heap-based buffer overflow vulnerability exists in Windows DNS Server that can be exploited by an authenticated attacker with network access. The vulnerability allows information disclosure through memory reading, with a CVSS score of 6.5 reflecting medium severity with network attack vector and required authentication.

Affected products

  • Microsoft Windows DNS Server

Timeline

  • 2026-10-13: disclosed

References

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