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CVE-2026-56194 Microsoft CVE debrief

A high-severity vulnerability, CVE-2026-56194, exists in Windows Network File System, allowing an authorized attacker to elevate privileges over a network. This heap-based buffer overflow vulnerability has a CVSS score of 8.8 and is considered HIGH severity. The vulnerability affects multiple versions of Windows, including Windows 10, Windows 11, and Windows Server. System administrators and security teams should prioritize patching this vulnerability to prevent potential privilege escalation attacks. Evidence is limited to CVE and NVD information, and the CVE record was published on 2026-07-14T18:18:29.757Z. It is recommended to apply patches or mitigations provided by the vendor to address this issue.

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
HIGH 8.8
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 security teams responsible for Windows Network File System and related infrastructure should prioritize patching this vulnerability to prevent potential privilege escalation attacks.

Technical summary

CVE-2026-56194 is a heap-based buffer overflow vulnerability in Windows Network File System. An authorized attacker can exploit this vulnerability to elevate privileges over a network. The vulnerability has a CVSS score of 8.8 and is classified as HIGH severity. It is recommended to apply patches or mitigations provided by the vendor to address this issue.

Defensive priority

High

Recommended defensive actions

  • Apply patches or updates provided by Microsoft to address the vulnerability.
  • Implement compensating controls, such as network segmentation or access restrictions, to limit the attack surface.
  • Monitor system logs and network traffic for potential exploitation attempts.
  • Conduct regular vulnerability assessments and penetration testing to identify and address potential weaknesses.

Evidence notes

The CVE record was published on 2026-07-14T18:18:29.757Z and was last modified on 2026-07-22T11:25:49.100Z. The NVD entry is currently Analyzed. The vulnerability affects multiple versions of Windows, including Windows 10, Windows 11, and Windows Server. Evidence is limited to CVE and NVD information.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-56194 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-56194

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

  • CVE-2026-56194 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-56194

    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.