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PatchSiren cyber security CVE debrief

CVE-2026-97843 Microsoft CVE debrief

A vulnerability in the DNS Server allows an authorized attacker to disclose information over a network due to an out-of-bounds read issue. This issue affects multiple Windows 10, Windows 11, and Windows Server versions. DNS Server administrators and security teams should assess exposure and apply patches from Microsoft for affected Windows versions. The vulnerability has a medium severity and requires attention from administrators and security teams to prevent potential information disclosure.

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

DNS Server administrators, security teams, and IT professionals responsible for Windows Server installations should assess exposure and apply patches.

Why it matters

CVE-2026-97843 is a medium-severity vulnerability in DNS Server that requires attention from administrators and security teams to prevent potential information disclosure.

  • Potential information disclosure over the network
  • Need to verify inventory of DNS Servers for affected versions
  • Requirement to apply patches from Microsoft for affected Windows versions
  • Importance of monitoring DNS Server logs for potential information disclosure attempts

Technical summary

CVE-2026-97843 is an out-of-bounds read vulnerability in the DNS Server that allows an authorized attacker to disclose information over a network. Affected versions include multiple Windows 10, Windows 11, and Windows Server versions. The vulnerability has a medium severity and requires attention from administrators and security teams to prevent potential information disclosure. Microsoft has released a patch for the issue.

Defensive priority

Medium priority for DNS Server administrators and security teams to assess exposure and apply patches.

Recommended defensive actions

  • Assess exposure of DNS Server installations to CVE-2026-97843
  • Apply patches from Microsoft for affected Windows versions
  • Verify inventory of DNS Servers for affected versions
  • Monitor DNS Server logs for potential information disclosure attempts

Evidence notes

The CVE Program and NVD provide official records of the vulnerability. Microsoft has released a patch for the issue. The vulnerability affects multiple Windows 10, Windows 11, and Windows Server versions. There are no reports of the vulnerability being exploited in the wild. The CVE record was published on 2026-10-13T19:01:41.409Z and has not been modified since then.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-97843 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-97843

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

  • CVE-2026-97843 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-97843

    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-2026-97843.json

    cve_program_cvelist_v5

  • Source reference

    Unverified legacy reference

    URL: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-97843

    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.