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CVE-2026-45636 Microsoft CVE debrief

CVE-2026-45636 is a high-severity vulnerability in Windows NTFS that allows an unauthorized attacker to execute code locally. The vulnerability has a CVSS score of 7.8 and was published on 2026-06-09T17:17:30.270Z. It affects various versions of Windows 10, Windows 11, and Windows Server.

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
HIGH 7.8
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 10, Windows 11, and Windows Server should be aware of this vulnerability and take necessary actions to mitigate it.

Technical summary

The vulnerability is a heap-based buffer overflow in Windows NTFS. It allows an attacker to execute code locally, which can lead to a compromise of the system.

Defensive priority

High

Recommended defensive actions

  • Apply patches from Microsoft as soon as possible.
  • Use secure coding practices to prevent similar vulnerabilities in the future.
  • Monitor systems for suspicious activity.

Evidence notes

The vulnerability is confirmed by Microsoft and has a CVSS score of 7.8.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-45636 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-45636

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

  • CVE-2026-45636 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-45636

    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.