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CVE-2026-56649 Microsoft CVE debrief

A race condition vulnerability exists in the Windows Network File System. This vulnerability allows an unauthorized attacker to execute code over a network. The vulnerability has a CVSS score of 5.9 and a severity of MEDIUM. The affected product is the Windows Network File System. The vulnerability class is a race condition. The likely operational impact is code execution over a network. The source confidence is limited to the information provided in the CVE record and NVD entry.

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
MEDIUM 5.9
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 Network File System should be aware of this vulnerability and take necessary precautions to prevent exploitation. The affected operators are system administrators. The affected platform is Windows. The vulnerability management impact is that patching is required. The security team impact is that monitoring and review of compensating controls are necessary.

Technical summary

The vulnerability is caused by a race condition in the Windows Network File System. This allows an attacker to execute code over a network without requiring user interaction. The vulnerability has been assigned a CVSS score of 5.9 and a severity of MEDIUM. The affected product context is the Windows Network File System. The defensive impact is that patching is required to prevent exploitation.

Defensive priority

Medium priority should be given to patching this vulnerability, as it can be exploited over a network without user interaction. The defensive priority is medium.

Recommended defensive actions

  • Apply the patch provided by Microsoft
  • Review and update Windows Network File System configurations
  • Monitor network activity for suspicious behavior
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE record was published on 2026-07-14T18:18:31.913Z and was last modified on 2026-07-17T13:37:28.380Z. The NVD entry is currently Analyzed. This information is based on the NVD entry and the CVE record. The vulnerability has been identified in the Windows Network File System, and its details are being verified.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-56649 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-56649

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

  • CVE-2026-56649 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-56649

    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.