Local code execution via VHD heap overflow
Published Sep 8, 2026 · Updated Sep 9, 2026
Heap-based buffer overflow in Microsoft's VHD Miniport Driver allows local authenticated users to execute code on affected Windows systems. Microsoft has disclosed that the flaw overwrites a heap buffer, but has not identified the responsible routine, input field, or malformed VHD operation. Exploitation requires local access, high privileges, and high-complexity conditions; successful exploitation runs code in the affected driver's security context.
Summary
What happened
Heap-based buffer overflow in Microsoft's VHD Miniport Driver allows local authenticated users to execute code on affected Windows systems. Microsoft has disclosed that the flaw overwrites a heap buffer, but has not identified the responsible routine, input field, or malformed VHD operation. Exploitation requires local access, high privileges, and high-complexity conditions; successful exploitation runs code in the affected driver's security context.
The record
- CVE
- CVE-2026-81355
- Published
- Sep 8, 2026
- Updated
- Sep 9, 2026
- Vendor
- Microsoft
- Product
- Windows Server 2019
- Classifications
- CWE-122
- Attack vector
- local
- Privileges
- admin
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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