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PatchSiren cyber security CVE debrief

CVE-2026-49797 Microsoft CVE debrief

A heap-based buffer overflow vulnerability exists in Windows NTFS, 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 Windows operating systems and could have significant operational impacts if exploited. The source confidence is limited, and defenders should review the context and verify the affected scope.

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 Windows operating systems should be aware of this vulnerability and take necessary precautions to mitigate the risk. Affected operators, platforms, and security teams should assess their exposure and prioritize remediation efforts based on their specific environment and risk profile.

Technical summary

The vulnerability is caused by a heap-based buffer overflow in the Windows NTFS component. An attacker could exploit this vulnerability by creating a specially crafted request that could lead to code execution. The vulnerability has been assigned a CVSS score of 7.8 and is classified as HIGH severity. The affected product context requires defensive impact assessment and source-grounded technical framing.

Defensive priority

High

Recommended defensive actions

  • Apply patches or updates provided by Microsoft to vulnerable systems
  • Implement compensating controls, such as monitoring and intrusion detection systems
  • Conduct regular vulnerability assessments and penetration testing
  • Enforce least privilege access and secure configuration of systems
  • Review relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE record was published on 2026-07-14T17:16:55.693Z and was last modified on 2026-07-16T15:55:54.730Z. The NVD entry is currently Analyzed. The vulnerability has a CVSS score of 7.8 and is classified as HIGH severity. The evidence is limited, and defenders should verify the affected scope and vendor guidance.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-49797 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-49797

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

  • CVE-2026-49797 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-49797

    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.