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CVE-2026-97844 Microsoft CVE debrief

The CVE-2026-97844 vulnerability is an out-of-bounds read issue in the DNS Server that allows an authorized attacker to disclose information over a network. This vulnerability has a CVSS score of 6.5 and is classified as MEDIUM severity. Multiple Windows versions and server editions are affected, including Windows 10, Windows 11, and Windows Server versions from 2012 to 2025.

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
MEDIUM 6.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-13
Original CVE updated
2026-10-14
Advisory published
2026-10-13
Advisory updated
2026-10-14

Who should care

Defenders responsible for Windows systems, especially those managing DNS servers or exposed to untrusted networks, should assess their exposure and prioritize patching.

Why it matters

CVE-2026-97844 is a MEDIUM-severity vulnerability in DNS Server that allows information disclosure. Defenders should prioritize patching affected Windows systems, especially those exposed to the internet or untrusted networks, and monitor DNS server logs for suspicious activity.

  • Potential information disclosure
  • Need to verify affected systems
  • Patching required for mitigation
  • Monitoring DNS server logs recommended

Technical summary

An out-of-bounds read vulnerability exists in the DNS Server, allowing an authorized attacker to disclose information over a network. Affected products include Windows 10 Version 1607, Windows 10 Version 1809, Windows 10 Version 21H2, Windows 10 Version 22H2, Windows 11 version 23H2, Windows 11 Version 23H2, Windows 11 Version 24H2, Windows 11 Version 25H2, Windows 11 version 26H1, Windows 11 Version 26H2, Windows Server 2012, Windows Server 2012 (Server Core installation), Windows Server 2012 R2, Windows Server 2012 R2 (Server Core installation), Windows Server 2016, Windows Server 2016 (Server Core installation), Windows Server 2019, Windows Server 2019 (Server Core installation), Windows Server 2022, and Windows Server 2025.

Defensive priority

Defenders should prioritize patching affected systems, especially those exposed to the internet or untrusted networks.

Recommended defensive actions

  • Patch affected Windows systems
  • Verify and apply Microsoft's security updates
  • Monitor DNS server logs for suspicious activity

Evidence notes

The CVE Program and NVD provide official records of this vulnerability. Microsoft has released a patch for this issue. Affected products include Windows 10 Version 1607, Windows 10 Version 1809, Windows 10 Version 21H2, Windows 10 Version 22H2, Windows 11 version 23H2, Windows 11 Version 23H2, Windows 11 Version 24H2, Windows 11 Version 25H2, Windows 11 version 26H1, Windows 11 Version 26H2, Windows Server 2012, Windows Server 2012 (Server Core installation), Windows Server 2012 R2,

Sources and references

Verified primary and authoritative sources

  • CVE-2026-97844 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-97844

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-97844 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-97844

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Role: DNS Server Information Disclosure Vulnerability

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/97xxx/CVE-2026-97844.json

    cve_program_cvelist_v5

  • Source reference

    Unverified legacy reference

    URL: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-97844

    Supplemental source - vendor-advisory, patch

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.