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CVE-2026-42972 Microsoft CVE debrief

CVE-2026-42972 is a MEDIUM severity vulnerability with a CVSS score of 5.5. It allows an authorized attacker to disclose information locally in Windows Hyper-V. The vulnerability was published on 2026-06-09T17:17:12.810Z and modified on 2026-06-10T19:55:47.920Z.

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
MEDIUM 5.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-09
Original CVE updated
2026-06-10
Advisory published
2026-06-09
Advisory updated
2026-06-10

Who should care

Administrators and users of Windows Hyper-V are advised to take action.

Technical summary

The vulnerability is caused by exposure of sensitive information to an unauthorized actor in Windows Hyper-V. An authorized attacker can disclose information locally.

Defensive priority

MEDIUM

Recommended defensive actions

  • Apply patches or updates provided by Microsoft to fix the vulnerability.
  • Refer to [ref-4](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42972) for mitigation or vendor reference.

Evidence notes

The vulnerability affects multiple versions of Windows 10, Windows 11, and Windows Server.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-42972 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-42972

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

  • CVE-2026-42972 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-42972

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

Supplemental references

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.