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CVE-2026-62699 Microsoft CVE debrief

A null pointer dereference vulnerability exists in the Windows Universal Disk Format File System Driver (UDFS). An authorized attacker could exploit this vulnerability to execute code locally. Microsoft has released patches for this vulnerability. The vulnerability requires local access to exploit and defenders should assess exposure and apply patches immediately. This vulnerability affects Windows 10, Windows 11, and Windows Server systems. System administrators should review system logs for potential exploitation attempts and verify patch application.

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
MEDIUM 6.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-08-11
Original CVE updated
2026-09-25
Advisory published
2026-08-11
Advisory updated
2026-09-25

Who should care

Windows system administrators and security teams should assess exposure and apply patches immediately. This vulnerability requires local access to exploit.

Why it matters

CVE-2026-62699 is a null pointer dereference vulnerability in Windows UDFS that allows local code execution. Defenders should apply patches immediately and review system logs.

  • Local code execution is possible for authorized attackers
  • Patching is required to prevent exploitation
  • System logs should be reviewed for potential exploitation attempts
  • Verify and apply patches for Windows 10, Windows 11, and Windows Server systems

Technical summary

The vulnerability exists in the Windows Universal Disk Format File System Driver (UDFS) and allows an authorized attacker to execute code locally through a null pointer dereference. The vulnerability has been patched by Microsoft. The vulnerability requires local access to exploit and defenders should assess exposure and apply patches immediately. This vulnerability affects Windows 10, Windows 11, and Windows Server systems.

Defensive priority

Apply patches immediately for Windows systems, especially those exposed to local access.

Recommended defensive actions

  • Apply patches for Windows Universal Disk Format File System Driver (UDFS) immediately
  • Verify and apply patches for Windows 10, Windows 11, and Windows Server systems
  • Review system logs for potential exploitation attempts

Evidence notes

The CVE record and NVD detail page provide information on the vulnerability. Microsoft has released a patch for this vulnerability. The vulnerability exists in the Windows Universal Disk Format File System Driver (UDFS) and allows an authorized attacker to execute code locally through a null pointer dereference. The CVE record was published on 2026-08-11T17:18:19.490Z and has not been modified since then. The NVD entry is currently Modified. Defenders should verify patch application,

Sources and references

Verified primary and authoritative sources

  • CVE-2026-62699 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-62699

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

  • CVE-2026-62699 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-62699

    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.