CVE-2026-97821: Microsoft DNS Server out-of-bounds read information disclosure

CVE-2026-97821 · Severity: medium · CVSS 6.5 · Published 2026-10-13

Microsoft DNS Server, which handles domain name resolution for networks, is vulnerable to an out-of-bounds read that allows an authorized attacker to access sensitive information. An attacker with network access to the DNS service could exploit this to disclose confidential data, potentially revealing system or configuration details that could be used in further attacks.

Technologies: Microsoft 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-2026-97821 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-97821 being exploited in the wild.
How severe is CVE-2026-97821?
Medium severity, with a CVSS score of 6.5, published 13 October 2026.
Which products and versions are affected?
Microsoft DNS Server.
Is there a fix for CVE-2026-97821?
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-2026-97821 attacked?
It is attacked over the network, in an operating system.
Am I affected by CVE-2026-97821?
Check whether you run Microsoft 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

An out-of-bounds read vulnerability exists in Microsoft DNS Server where an authorized attacker can craft network requests to trigger memory access beyond allocated buffer boundaries. The vulnerability requires network access to the DNS service and valid credentials or authorization. Successful exploitation results in information disclosure of server memory contents.

Affected products

  • Microsoft DNS Server

Timeline

  • 2026-10-13: disclosed

References

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