Local code execution via heap buffer overflow
Published Apr 14, 2026 · Updated Apr 14, 2026
Heap-based buffer overflow in Microsoft Windows Hyper-V allows local users to execute code through a crafted interaction. Microsoft has not published the affected Hyper-V routine, input format, or the unchecked operation that overruns heap storage. Exploitation requires local access and user interaction; successful exploitation executes code in the affected host context.
Summary
What happened
Heap-based buffer overflow in Microsoft Windows Hyper-V allows local users to execute code through a crafted interaction. Microsoft has not published the affected Hyper-V routine, input format, or the unchecked operation that overruns heap storage. Exploitation requires local access and user interaction; successful exploitation executes code in the affected host context.
The record
- CVE
- CVE-2026-26156
- Published
- Apr 14, 2026
- Updated
- Apr 14, 2026
- Vendor
- Microsoft
- Product
- Windows Server 2019
- Classifications
- CWE-122, CWE-20, CWE-125, T1203
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 14, 2026CVE publishedPublication date reported by the CVE source.
- Apr 14, 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 <10.0.17763.8644
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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