Authenticated code execution via hypervisor heap overflow
Published Sep 8, 2026 · Updated Sep 9, 2026
Heap-based buffer overflow in Windows Hyper-V allows local authenticated users to execute code across a security boundary. Microsoft identifies the Hyper-V component and heap-overwrite class but has not published the vulnerable routine, input field, or faulty bounds operation. Exploitation requires low privileges and local code execution on an affected Windows system, with no user interaction.
Summary
What happened
Heap-based buffer overflow in Windows Hyper-V allows local authenticated users to execute code across a security boundary. Microsoft identifies the Hyper-V component and heap-overwrite class but has not published the vulnerable routine, input field, or faulty bounds operation. Exploitation requires low privileges and local code execution on an affected Windows system, with no user interaction.
The record
- CVE
- CVE-2026-69603
- Published
- Sep 8, 2026
- Updated
- Sep 9, 2026
- Vendor
- Microsoft
- Product
- Windows Server 2019
- Classifications
- CWE-122, 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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