Local privilege escalation via VHD driver out-of-bounds read
Published Sep 8, 2026 · Updated Sep 9, 2026
Out-of-bounds read in Microsoft's VHD Miniport Driver allows local users with low privileges to elevate privileges on affected Windows systems. Microsoft has not published the driver routine, malformed VHD structure, or incorrect bounds operation that causes the read. Exploitation requires local low-privilege access and can grant elevated control while compromising confidentiality, integrity, and availability.
Summary
What happened
Out-of-bounds read in Microsoft's VHD Miniport Driver allows local users with low privileges to elevate privileges on affected Windows systems. Microsoft has not published the driver routine, malformed VHD structure, or incorrect bounds operation that causes the read. Exploitation requires local low-privilege access and can grant elevated control while compromising confidentiality, integrity, and availability.
The record
- CVE
- CVE-2026-69549
- Published
- Sep 8, 2026
- Updated
- Sep 9, 2026
- Vendor
- Microsoft
- Product
- Windows Server 2019
- Classifications
- CWE-200, CWE-125, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Sep 8, 2026CVE publishedPublication date reported by the CVE source.
- Sep 9, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=10.0.17763.0 <10.0.17763.9245
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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