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CVE-2026-45607 Microsoft CVE debrief

CVE-2026-45607 is a HIGH severity vulnerability in Windows Hyper-V that allows an unauthorized attacker to execute code locally. The vulnerability has a CVSS score of 8.4 and was published on 2026-06-09T17:17:29.563Z. The vulnerability affects multiple versions of Windows 10, Windows 11, and Windows Server.

Vendor
Microsoft
Product
Windows Hyper-V
CVSS
HIGH 8.4
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-09
Original CVE updated
2026-06-11
Advisory published
2026-06-09
Advisory updated
2026-06-11

Who should care

Administrators and users of Windows Hyper-V are advised to review and apply the necessary patches to mitigate this vulnerability.

Technical summary

The vulnerability is an out-of-bounds read in Windows Hyper-V that allows an unauthorized attacker to execute code locally. The vulnerability has been assigned a CVSS vector of CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Defensive priority

HIGH

Recommended defensive actions

  • Apply the necessary patches from Microsoft to mitigate this vulnerability. Refer to [ref-4](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45607) for more information.

Evidence notes

The vulnerability affects multiple versions of Windows 10, Windows 11, and Windows Server. Refer to the [NVD detail page](https://nvd.nist.gov/vuln/detail/CVE-2026-45607) for a full list of affected versions.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-45607 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-45607

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

  • CVE-2026-45607 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-45607

    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.