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7.8
Windows Hyper-V: Local Code Execution via Heap Overflow
CVE-2026-26156
Summary
A security issue in Windows Hyper-V allows an attacker with local access to execute malicious code on a vulnerable system. This could potentially allow the attacker to take control of the system or disrupt its operation. To protect your system, ensure you have the latest Windows updates installed.
Original title
Heap-based buffer overflow in Windows Hyper-V allows an unauthorized attacker to execute code locally.
Original description
Heap-based buffer overflow in Windows Hyper-V allows an unauthorized attacker to execute code locally.
nvd CVSS3.1
7.8
Vulnerability type
CWE-20
Improper Input Validation
CWE-122
Heap-based Buffer Overflow
CWE-125
Out-of-bounds Read
Published: 14 Apr 2026 · Updated: 14 Apr 2026 · First seen: 14 Apr 2026