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CVE-2026-57093 Microsoft CVE debrief

CVE-2026-57093 is a high-severity vulnerability in the Windows Ancillary Function Driver for WinSock. An authorized attacker can exploit this use-after-free vulnerability to elevate privileges locally. Microsoft has released a patch for this vulnerability. The vulnerability has a CVSS score of 7 and is classified as HIGH. System administrators should prioritize patching affected systems.

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
HIGH 7
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 steps to patch their systems. This vulnerability can be exploited locally by authorized attackers to elevate privileges.

Technical summary

The vulnerability exists in the Windows Ancillary Function Driver for WinSock and allows an authorized attacker to elevate privileges locally by exploiting a use-after-free condition. The vulnerability has a CVSS score of 7 and is classified as HIGH. Microsoft has released a patch for this vulnerability.

Defensive priority

High

Recommended defensive actions

  • Apply the patch released by Microsoft
  • Ensure all Windows operating systems are up-to-date
  • Monitor system logs for suspicious activity
  • 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 2026-07-14T18:18:33.997Z and was last modified on 2026-07-17T14:52:51.793Z. The NVD entry is currently Analyzed. This vulnerability affects Windows Ancillary Function Driver for WinSock. Microsoft has released a patch for this vulnerability. Evidence is limited to CVE and NVD details.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-57093 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-57093

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

  • CVE-2026-57093 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-57093

    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.