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CVE-2026-50485 Microsoft CVE debrief

A buffer over-read vulnerability exists in Windows Hyper-V that could allow an authorized local attacker to cause a denial of service via an adjacent network. The vulnerability has a CVSS score of 4.5 and a severity rating of MEDIUM. Microsoft has released a patch for this vulnerability. This vulnerability affects Windows Hyper-V systems, and system administrators should review and update system configurations to ensure Hyper-V is properly secured. The vulnerability is a buffer over-read issue in Windows Hyper-V, and an authorized local attacker could exploit this vulnerability to cause a denial of service via an adjacent network.

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
MEDIUM 4.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-14
Original CVE updated
2026-07-21
Advisory published
2026-07-14
Advisory updated
2026-07-21

Who should care

System administrators and security teams responsible for Windows Hyper-V systems should be aware of this vulnerability and take steps to mitigate it. They should review and update system configurations to ensure Hyper-V is properly secured and monitor system logs for potential exploitation attempts.

Technical summary

The vulnerability is a buffer over-read issue in Windows Hyper-V. An authorized local attacker could exploit this vulnerability to cause a denial of service via an adjacent network. The CVSS vector for this vulnerability is CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H. This vulnerability affects Windows Hyper-V systems, and system administrators should review and update system configurations to ensure Hyper-V is properly secured.

Defensive priority

Medium priority

Recommended defensive actions

  • Apply the patch released by Microsoft
  • Review and update system configurations to ensure Hyper-V is properly secured
  • Monitor system logs for potential exploitation attempts
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE record was published on 2026-07-14T18:17:54.560Z and was last modified on 2026-07-21T18:22:37.117Z. The NVD entry is currently Analyzed. This vulnerability affects Windows Hyper-V systems, and an authorized local attacker could exploit it to cause a denial of service via an adjacent network. The CVSS vector for this vulnerability is CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H. The vulnerability has a CVSS score of 4.5 and a severity rating of MEDIUM. Microsoft has released a patch for this vulnerability. Evidence limits suggest that additional information may be available from Microsoft or other sources, but it has not been verified.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-50485 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-50485

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

  • CVE-2026-50485 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-50485

    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.