CVE-2026-97839: Microsoft DNS Server out-of-bounds read

CVE-2026-97839 · Severity: medium · CVSS 6.5 · Published 2026-10-13

A flaw in Microsoft's DNS Server allows an authorized attacker to read information beyond intended memory boundaries. An attacker with network access and valid credentials can exploit this to disclose sensitive data from the DNS service.

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-2026-97839 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-97839 being exploited in the wild.
How severe is CVE-2026-97839?
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-2026-97839?
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-2026-97839 attacked?
It is attacked over the network, in a hosted service.
Am I affected by CVE-2026-97839?
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 that allows an authenticated attacker to read memory outside allocated buffers. The vulnerability requires network access and valid authentication credentials. Successful exploitation could leak sensitive information from DNS server memory.

Affected products

  • Microsoft DNS Server

Timeline

  • 2026-10-13: disclosed

References

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