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CVE-2026-50347 Microsoft CVE debrief

A Heap-based buffer overflow vulnerability exists in Windows Data dll, which could allow an unauthorized attacker to execute code locally. The vulnerability has a CVSS score of 7.8 and is classified as HIGH severity. This vulnerability affects multiple versions of Microsoft Windows, including Windows 10, Windows 11, and Windows Server. System administrators and users should be aware of this vulnerability and take necessary precautions to mitigate the risk. The CVE record was published with limited source detail, and defenders should verify affected scope and vendor guidance.

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
HIGH 7.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-14
Original CVE updated
2026-07-22
Advisory published
2026-07-14
Advisory updated
2026-07-22

Who should care

System administrators and users of Microsoft Windows operating systems should be aware of this vulnerability and take necessary precautions to mitigate the risk. This includes reviewing the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.

Technical summary

The vulnerability is caused by a heap-based buffer overflow in Windows Data dll. An attacker could exploit this vulnerability by tricking a user into opening a malicious file or link, allowing them to execute code locally. The vulnerability affects multiple versions of Microsoft Windows, including Windows 10, Windows 11, and Windows Server. There is currently no information on known ransomware campaign use.

Defensive priority

High

Recommended defensive actions

  • Apply patches or updates provided by Microsoft to vulnerable systems
  • Implement compensating controls, such as intrusion detection and prevention systems
  • Monitor systems for suspicious activity
  • Restrict access to sensitive areas of the network
  • Conduct regular vulnerability assessments and penetration testing

Evidence notes

The CVE record was published on 2026-07-14T18:17:34.627Z and was last modified on 2026-07-20T15:22:38.800Z. The NVD entry is currently Analyzed. This vulnerability affects multiple versions of Microsoft Windows, including Windows 10, Windows 11, and Windows Server. There is currently no information on known ransomware campaign use. The CVE record was published with limited source detail, and defenders should verify affected scope and vendor guidance.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-50347 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-50347

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

  • CVE-2026-50347 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-50347

    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.